Don't remember the numbers but according to gamespys research, the majority of gamers have machines capable of running next gen stuff. (aka deferred shading 'n stuff...)
Maybe you are right I dont have actual figures
However for casual gamers I mean someone playing games from time to time
It is not just a matter of price
If you you use a computer just as a word processors on regular basis than even outdated computers are ok
This kind of audience does not change a graphic card so often, regardless of the price, simply because they are not interested
