[jiggy2011]

Consoles don't have to compete with alternative publishers (MS takes a cut off of every new Xbox game sold regardless of the store, Valve doesn't get a cut of every PC game unless it is sold via Steam).

They also don't have to compete with the scariest publisher of them all, bittorrent; who sells everything for $0.

Console games are probably priced quite well to maximize marginal revenue. I know people who will drop $40 on a console game but who would not be willing to spend $20 on the same game for PC simply because there is a pirate version available.