Opengl

Riddle me this:

If OpenGL is supposed to be just as good if not even better than Direct3D (Not talking about DirectX here), then why don't developers use OpenGL to program their games generating some extra sales on GNU/Linux and Macintosh?

Also, Mac users don't know what the word "game" means. They thing it's a weird pronunciation of "gay 'em" which roughly translates as "turn them gay"