Hmm, firsly saying that there is no skill involved in racing games is just weird. Does that mean there is no skill in racing real cars as opposed to shooting real guns? There is skill involved in whatever game you play, whether it be FPS, RPG or racing. And why should it be any different whether its on a console?
Also trying to compare completely different genres of games like CS and GT4 doesn't really make sense.
But hey, everyone is entitled to their own opinions
Secondly,
I'll just throw some number in here that I found.
GT series, units sold ~ 38million
Halflife/CS, units sold ~ 8million