It's not at all clear to me why Linux in particular ought to be ignored. Recent experiments like humblebundle.com suggest that Linux users are a larger gaming

It's not at all clear to me why Linux in particular ought to be ignored. Recent experiments like humblebundle.com suggest that Linux users are a larger gaming market than Mac users. Also, obviously the strategy for making a cross-platform title needs to be "use cross-platform tools". It sure worked for Minecraft! And unlike Mac, in the case of Linux you have a volunteer community ready and eager to help you iron out the kinks. And it's such old news that I'm almost embarrassed to be repeating it, but the position of the WINE team is nearly "let us know what we need to change in our platform to make your existing Windows game run, and we'll do it". All in all, I'd put Linux deployment ahead of OSX deployment, if it was me. But I admit I'm biased.