What percentage of PS3 owners are FPS fans?

[Vetteman94]

I would say i'm a big fan, 13 out of the 40 PS3 games I own are FPS games. And seeing that FPS do pretty decent on the PS3, I would say around 25% of PS3 owners are fans of FPS games. So Killzone 2 should sell between 3-4 million, but thats just my guess.