Psychonauts didn't not sell because people buy sequels. It didn't sell because of little marketing, and what little their was made it seem like a kids game.
BTW, I have the game on PC, but I actually knew what the game was about.
A flashy-first game is awesome when it comes out. A great-first game is awesome forever.
Plus, just for the hell of it: Kelly Brook at the 2008 BAFTAs