From Eurogamer:
[...]
With over 30 million GeForce 8-series GPUs shipped, there's a good return on investment for that - especially since the physics acceleration on the PC is transferable back to console, or vice versa.
People say that PC gaming is dying? And this doesn't even include all the PC gamers like me that are still using 7000 series cards, or all the ATI users out there.
Oh, and to the people that ignore the PC when comparing exclusives because "few people use PCs for gaming," what say you? 30 million is larger than the install base of any current gen console, and that's only a portion of the PC gaming community.