Q:

You have some cheat codes for real life, but they're expensive to use. Can they still be used?

While smashing heavier and heavier particles together to create super heavy elements 122, 123, and 124, scientists noticed that these collisions created strange, random-looking electromagnetic waves. 
Upon further inspection, it turned out that these waves have patterns. The patterns repeat, but with small changes every time. 
After decades of research, the scientists were able to prove that this was the world's source code. 
By modifying and sending out the electromagnetic waves in specific patterns, they were able to do things that were thought to be physically impossible, such as teleporting objects.
The scientists were able to create machines that had the capability to produce the following "commands":

Add a force to an object (from fractions of a nano-newton to several tera-newtons)
Move (teleport) an object
Clone an object (They can't create an object as it was too complex to figure out)
"Delete" an object 
Slow down or speed up time for everything, or a specific object (but can't stop/reverse time)
Change physical constants (such as the gravitational constant)
Change how an object interacts with the higgs field (giving it more weight or less weight, even 0 weight). Mass stays the same.
and some others.1

The machines aren't terribly expensive to make (say, \$50 million) but are prohibitively expensive to operate. They are out of the reach of almost all civilians and corporations (say, \$250-500 million/hour) due to the energy cost and the several Olympic sized swimming pools of coolant required to keep the machine from overheating.
Seeing that there is a huge cost to run the machine, could there be anything that it could be used for, or would the cost make the machine useless? 
1You can add additional "commands" if you think they would be helpful, but the scientists are still in their early stages. They can't revive people, they can't cure people or anything of that like. Just basic physics defying actions.
EDIT: The machine isn't magical. It can't create energy but instead re-distribute it from the rest of the universe. The universe's total energy won't change no matter how many times you create something/delete something.
Teleporting creates small temporary wormholes, and slowing or speeding up time makes the object act as if it's going fast or slow relative to the rest of the universe.

A:

I would start by using the machine to do the following:

Cool itself down
Generate electricity

My goal here would be to generate a surplus of electricity, beyond what the machine needed to run, and to generate a surplus of coolant, beyond what the machine needed to stay cool.
I'd use my coolant and electricity, of course, to run a second machine for free. With this machine, I'd clone up parts for a third machine, which would provide power for a fourth machine, and so on. I'd build a few thousand, maybe a few tens of thousands. I've got exponential growth if I want, with no need for raw materials or any form of input. (More food for the employees? Clone it. Want to pay them? Clone some gold).
Eventually, I'd have the resources to eliminate all poverty everywhere on the globe and remove all resource scarcity everywhere. I'd make this available to everyone for free and usher in a golden age for humanity.
After all of that, I'd build a huge machine, big enough to teleport a space station. Time to explore the galaxy!

A:

The gains would be if you can make a change that only takes some minutes of operating, but had lasting changes.  If it takes minutes of the machine to properly irradiate a person so that their time is accelerated, making everything else slower in comparison, you have created a limited version of The Flash.  Sure, being human he (or she)  would live their remaining 50 years of active life in 25 of the world's, but you have enabled a superhuman to exist with this machine.
The teleportation ability would be the first financially capable one, I suspect.

The cost of the Falcon 9 rocket alone is 54 million, SpaceX tells Quartz, but it only burns 200,000 worth of fuel. If each rocket were reusable, and the only costs to launch a satellite were fuel and various ground support services, that would dramatically reduce the cost of getting to space.

That sounds like a good candidate for cloning.  If you can clone 10 of them in an hour, at an operational cost of 500 mill/hr, that saves you $40 million.  And the ISS cost to date is staggering.
The defense industry would want the machine to clone itself, so they could have one for absolute weapon delivery purposes.  We have countermeasures for ICBMs, but not teleportation.  If what the machine is acting on does not need to be encased by the machine, then the DOD could just delete the Kremlin, or Bin Laden.
Reading the question a little more,

the world's source code... sending out the electromagnetic waves in specific patterns

It sounds like enclosure by the machine is not necessary.  In that case, I would bet the US would be willing to double the national debt to get it, or just take it by force "in the interest of national security".  A lot has changed since 9/11.
Assuming you have built this in Greenland, to take advantage of the more effective cooling in a mostly frozen place, and the nearby geothermals for energy.  The existence of this machine would encourage every major nation to invade.
In the movie Real Men we are negotiating with aliens to get the "really big gun" capable of destroying a world, so we can use it against the Russians.  In some ways, that is how an arms race works. It doesn't matter if the scale is ridiculous, we have to have a bigger one than them.

prohibitively expensive to operate

This is a subjective thought, which is why I have tried to list some interested parties that do not share it.
EDIT Also, deleting radioactive waste that we still don't know what to do with.  Not cost effective for anyone, but certainly a good test for the delete function.

A:

The feasibility of what I’m about to consider depends on some unspecified factors (how long must the machine be running for each command, how does object size affect cost, etc).
The Users
The cost of operating this machine is definitely going to put most individual usage out of reach. There will be some exceptions for people with net worths close to and over a billion dollars, but the current usages of the machine aren’t terribly advantageous to a single person. Cloning might be an interesting one depending on its limitations, but it seems more likely that very wealthy individuals would reroute their philanthropic funding to research new commands. These people are going to be interested in figuring out how to get it to cure disease and, more importantly, expand the natural human life.
Corporations could definitely use this device from a purely financial standpoint. Many corporations have annual profits measured in the billions, so shaving off a billion a year wouldn’t be unreasonable if they could increase their profits even further with the machine. The problem here is the difficulty of finding a command or series of commands that would actually net them more profit than they burn to use the device. I don’t think the existing commands would provide that benefit, but I don’t want to speculate with new commands.
Governments are going to be the power users of this device, most likely for research. In practice it’s likely that all of the devices will be built and owned by governments, with corporations and private individuals renting time at the cost of operating them.
The Uses
Many of the uses that stand out seem to fall into the “for science!” category. Amazing research opportunities are opened up here, especially with the changing of the constants. After recently considering the realities of a galactic empire without FTL travel, the possibility of increasing the speed of light felt very attractive. Unfortunately, that would have some pretty bad side effects. The downside to changing constants is that other values need to change in response, often with terrible consequences. There was a media uproar when people thought CERN might accidentally create a black hole… imagine what people would think when scientists start talking about changing universal constants. One other conceivable scenario, however, might be an attempt to tweak constants to make it easier to modify the universe's source code.
Planetary defense against asteroids would become much simpler. Several of the commands would almost guarantee our safety from extinction-level impacts. Deletion would obviously be best (as long as we can simply give the machine coordinates). Alternatively we could add a nice amount of force to it in a particular direction, or simply teleport a spacecraft from the surface to its orbit.
I think the biggest and most important use, however, will be space exploration and colonization. It would be revolutionized. Current estimates put the cost of the first mission to mars (and the effort to get to that point) close to $100 billion. If you redirected that money into the machine, you could get 200-400 hours of operation… teleporting people, supplies, even entire pre-built structures right to the surface of Mars. No more rockets, no more 6 month flight. Depending on the limits of teleportation functionality, we could do some amazingly crazy things.
All in all, I don’t think the prices you’ve specified would render the machine useless. It would, in all likelihood, massively increase the odds of our species surviving.

