> Mac OS is close to nonexistent in that area in the rest
  > of the world.

I guess you dont't live in the rest of the world. I am from a small exUSSR country in the Europe and while I would not claim majority for OS X but to claim that it is nonexistent is very wrong. My last company (Java/PHP/Frontend) was Mac-only. In the current company the majority is on Macs (that includes Android and WP developers).