I believe Microsoft's gaming ecosystem plays a huge part in this gap. If you develop your game in the Microsoft world, say, for XBox, almost nothing is left by

I believe Microsoft's gaming ecosystem plays a huge part in this gap. If you develop your game in the Microsoft world, say, for XBox, almost nothing is left by the time you're done porting to Mac OS, while porting from Mac OS to Microsoft is much easier - not perfect though. I can dig up links if anyone wants them.