Can Mac App Store Apps be "sideloaded"? The issue I am facing is bandwidth is very expensive where I live, I pay by the MB so if I need to install Final Cut on 10 different computers it would be murder to download it 10 times, is it possible to install on one computer and then move the files over and just pay for it on the other computer without having to get the files again? Or is the installation tied to a computer? Thank you.
You can copy/paste the application from one Mac to another, they will run as they are self-contained (no files required in other locations).

You may not even need to login to the App Store to run them. I had to install Xcode and Final Cut Pro on a very restricted network environment where the App Store is blocked, the apps ran fine.

Licensing is an issue if you use the apps in a non-personal environment (businness, education). Download and install work the same way.