Why top touring bikes have no suspension forks? I'm in the search for a new long distance touring bike, and I'm surprised that most top models have no front suspension (IDWorks, Tout Terrain, Koga, etc.).

It looks like front suspension is a rarity at the top, but available on middle class trekking bikes. The top bikes with specific long distance touring geometry and specs are less available with front suspension. Some trekking bikes that I've found with front suspension:


Cannondale Tesoro 1 2014
Rose Black Creek 
Koga-Miyata Feathershock
Giant Expedition AT 2013 (not sold anymore)
Schwalbe's balloon bike concept in general http://www.balloonbikes.com/en/


Background:

I have been riding a Cannondale Headshock bike for commuting and touring in the last ten years, and I loved the front suspension. I find it softer on the hands/wrists, especially on long rides. If the suspension is off, and I ride a full day, my hands get much more tired, vs. with the suspension on. Handwriting for example is much harder after a long day of riding, with suspension off.

I had zero issues with the fork, functions since 2004 without issues. I do have a front rack, too. The bike has wide tires (IRC Lover Soul, 26x2.25).

So it seems the benefits are there, there are no maintenance issues (was serviced regularly), racks can be mounted on them, and cost in the upper segment shouldn't be an issue. And the top touring bikes are still offered without front suspension. Why?

Edit:

Let me ask again: my question is NOT about the pros and cons of using a suspension fork in touring in general, or whether you think I need it or not, or what is my definition of a touring bike, or whether there are touring bikes with suspension or not (there's a lot of them). 

My question is:

Why is that while many middle range touring bikes are with front suspension (1000-2000 Euro bikes), then most of the TOP of the line touring models (4000 Euro and above) are without?

My logic would be that if it is offered in mid range, it's also offered on the top bikes, too.

See for example the range of Rose bikes, who are one of those manufacturers who sell among the highest number of touring bikes. Rose has 20 different "Tourenräder" for 1000-2000 Euro, so these middle range touring models are almost all with front suspension. If I look at Tout Terrain for example, from the 10 top of the range models, they only have two model with front suspension, the Panamericana, and all the rest is fixed fork.


Money: it is not a reason while these bikes are over 4000 Euro anyway, and mid range bikes are with suspension.
Ease of repair: I see not a reason while disc brakes, carbon drive, hydraulic brakes, XT derailleurs are equally fine machinery that need care, and difficult to repair on site. To me, the dérailleur is the most delicate part of any bike, it gets damaged during transport or hard terrain easily, and very difficult to repair. And anyway, parts can be delivered by DHL anywhere. And again, mid range bikes are with suspension.
Weight: these bikes are 15+kg, just the Schwalbe tyres are 700-800g each, the pack is around 20kg, so shaving off 200-300g from the bike weight doesn't matter.
Force: if a fork can withstand downhill, they should handle touring.


So none of these justify why offer lots of mid-range touring bikes with suspension, and then the top range much less.
There are a couple of reasons.

The KISS Principle

If anything vital breaks while you're touring and you can't fix it on the spot, you're stranded. You're too far from home to call your mom for a ride. Unless you have a spare for the broken part, your options are some DIY jerry rigging and/or praying that someone with a truck comes by who will carry you and all your stuff to the nearest town. There's less that can go wrong with a rigid fork, so less chance of being stranded. 

Standard parts are easier to replace and repair

Rack-ready suspension forks are irreplaceable, irrepairable abominations. Ok, that's an exaggeration. But it's definitely harder to get a replacement or get it repaired. Head shock? Only one of the three bike shops in my town sells Cannondale stuff. If you end up in a smaller town with one bike shop (or none) you may be out of luck. If you find yourself limping along to some no-name town in the middle of nowhere, your best hope for repairs is to have standard parts. 

It's true that you can find mounting apparatuses (apparatii?) that will allow a rack to mount to a standard suspension fork but they all require additional parts, violating the KISS Principle.

Weight

In spite of (or perhaps, because of) the abundance of gear that tourists carry, there are weight-weenie tourists. Suspension forks are heavy. Or at least heavier. 

Efficiency

Another reason is that a suspension absorbs energy, and rationing ones energy is a primary concern of the long-distance tourist. 

Physics (supposedly)

When I first got into touring there was a notion that suspension forks weren't designed to withstand the lateral forces of braking well enough to add weight to the fork. The idea was that the forward force of the bike's weight on the steer tube and the forward weight of the panniers on the lowers would flex the fork and damage it. This seems to have either been overcome or disproven, but old ideas sometimes die hard. This is probably the reason that Giant used such a bizarre contraption on the front of their Expedition AT, to compensate for those forces.

Most people just don't need it

Most people tour on the road where suspension doesn't really do enough to justify all the other costs. 

As others have mentioned in the comments, if you're having wrist pains there is most likely a fit/setup issue with your bike. There are any number of possible solutions, all of which would be specific to you and your bike. See your LBS for advice.