Linux people don't pay for sofware anyway.
Neither do Windows users. They get it all free with their new computer, and steal the rest. I'm beginning to wonder whether the Mac stuff is worth bothering with.
You should probably ask established independant developers. Like Blizzard. And I'll wager making a Mac verison of World of Warcraft was a little more expensive and time consumeing than buying a Mac, installing BlitzMAX, and hitting 'Compile'. If I had an Intel Mac I'd be sorely tempted to use Windows for games.
If you only want a Mac for playing games, you are not making a sensible purchace. People do not buy Macs primarilly for playing games. They buy Macs because it represents a whole product, along with their iPod, iTunes, and favorite podcasts, and comes with out-of-the-box software to do these things, and do them well.