The problem is: How the heck can any one intend to sell something for a system he can not even support nor does he/she understand the system?
Who says they haven't got support or understanding for the system?
However, what sort of feedback have people got on compiling their games on Win, Linux and Mac?
It takes too long and isn't particularly intuitive. Rollout proceedures are next to impossible to automate, require 4 different machines and a lot of manual supervision (making sure all four machines checkout the correct branch, and get bundled properly together on a network share).
There is no room for errors at all (unless you want to start all over again).
So is it true that you can only compile on computers that you own?
Yeah. Like tonyg said, there really isn't much point in providing binaries that might not even work.