Dunno, they're extremely popular in Switzerland, where I live. I think among consumers, Mac market share is quite high. It's different in businesses, but businesses don't buy that many games :-)
i agree among consumers its high, but its still 4mil per quarter compared to 100s millions windows, android and iOS move per quarter. Also developer support is pretty poor when it comes to games on Mac and usually are buggy ports which are released 6-12 months after windows release. Part of the problem is Apple being lazy with Open GL support on OS X platform which just recently hit 4.0 with Mavericks. The situation is completely opposite on iOS where they even feature games during keynotes and went as far as to make their own Framework called sprite Kit to write games on iOS platform.
