I don't see anyone playing CS, BF2, WoW, GW, PK, D2, or any other major games out there on Linux.
Why don't you hop on some cool games... Quake 3, Enemy Territory, Unreal Tournament, and see if you can spot a linux player... Infact, the first day I played Tremulous... The room was filled with like 6/8 linux users... Me being one of the Windows users.