How many people play FPS games

Ok I jsut want to know how many people play FPS games.

Games like:
Battlefield 2
Battlefield 2142
Call of Duty 4
CounterStrike Source
etc.etc.

I do alot of gaming as a novice.
I bet If I learn to do better with gfx ill stop gaming. O_o

I use to play FPS games. Counter-Strike use to be my fav FPS then it got old and repeatative LOL. I like Halo but only borrowed it, never bought it. Same for COD4.

I'm more of an RPG gamer than an FPS gamer. Maybe I'll eventually switch back though LOL.

Im playing COD4 On the pc

CoD4
CS
CSS

Thats about it