Earlier quoted context omitted.
OS X is not a good platform for gaming. It has a significantly smaller user base of which only an even more significantly smaller are gamers. Playing on a MacBook (or at least on my MacBook) is impossible, and I wouldn't buy an iMac for gaming. On the other hand, you can put Linux on anything (for free!), from your mom's 2002 pc to the latest generation hot stuff. This means there is indeed a potential, and somebody…
Why is playing on a MacBook impossible? (not a Mac user, serious question)
Plus they manage to have even more buggy OpenGL support, and their drivers are well known among OpenGL developers for lying about supported features.