Did you happen to see the price for Deus Ex HR on Mac vs PC? PC is like $6 on Steam. Its still pretty much opening day prices for mac...like $50. And I am still actually grateful they even released this for a Mac. I have given up on macs for any gaming. The price difference alone on the games will justify a separate gaming PC or a console.
Yeah unfortunately price is still a massive issue for Mac Games. For Deus Ex specifically I can only comment for the UK, where it is £34 (just over $50), but to be honest, while PC games are dirt cheap, you generally expect to pay £30-£40 for a good console game, and even for the best PC games when they are new. Its just the demand I think, that is the key issue - developers like feral and Aspyr need an incentive to keep making games for Mac, and they just couldn't make ends meet at $6 per game, unless the number of Mac gamers drastically increases.