Normal gamers don't care enough. Only hardcore gamers.
Fair enough your PC is better, but for people who just want to chill out after work for half an hour (or more sometimes) on xbox live (or splitscreen if you have friends) consoles are the only real option.
Normal gamers like good graphics but won't pursue them in a monetary sense until a new console or game is released because it's not their hobby or interest... it's a nice commodity.