Why do 99% of videogames pander to white (especially American) audiences?

[Gamerace]

In related news in RE5 you will get to play as a black female (at least some of the time) which, come to think of it, may be a first for video games.

http://ps3.ign.com/articles/887/887351p1.html

At least I assume she's black since she's African.