Well, most game development happens for consoles - so if the question is "Why game developers use Windows" not "Why PC game developers use Windows", then it still is an interesting quesion.
If you're coding for PS3 or Wii, why is Windows better than Linux or Mac? Marketshare doesn't explain that.
The tooling is generally better on Windows, or was. A buddy of mine who does some pretty intense PS3 work switched to a Mac about a year and a half ago and said that it was rough going when he'd tried a year or so before that.
If you're coding for PS3 or Wii, why is Windows better than Linux or Mac? Marketshare doesn't explain that.