Just want to throw some info/insight out there to the developers/owners on this subject. Looking up the total market share of OSX users, it's currently about 7%. Ya, that's small in comparison to Windows, but here are a few bits of info you guys should know moving forward. First, Mac users are on the rise with young adult users (thanks to iPhones, trying to be cool, whatever), and many future CS students from top schools are Mac users (which may or may not lead to an increase in market share) in the future.
Now, this may just be a bay area thing (just to throw that out there, as I don't have other info). But my time at UC Berkeley I found most students (including myself), especially in STEM, were Mac users. And this isn't limited to just CAL, I saw the same at Stanford and UCSF. And now in the workplace most of those same students are carrying that operating system with them when possible. My point is Macs are more popular now than ever, at least in this area, and it could climb quickly.
And here's the other thing, what competition do you guys face in the OSX market, Falcon? My point, it's a market you could easily dominate with little resistance. If the OSX operating system does boom (and you believe that's a possibility), do you guys want to be ready to profit from that boom, or spend years playing catchup?
In full disclosure, I'm a Mac user in my personal life and constrained to use a PC at work. Personally, I'd be fine installing windows on my Mac to play this game. And maybe many others would feel the same way. But everyone doesn't feel the same, and these are possible customers you'd reject with your current business plan, just food for thought.