Console exclusive DO convince people to buy consoles because the PC isn't a console, not everyone has a gaming PC, and the vast majority of people who want to play games on their big TV while sitting in their Lazy Boy and eating snacks aren't going to lug their PC Tower into the living room.
Compare what you want, but the truth is that when people walk into a Walmart and look at the rack of games between PS3 and Xbox 360 very few go check to see if the ghost town of a PC section has any of the same games.