Well yea youcould get a certain amount of AP's Dollars after you pass like level 5 20 and complete it or something and with AP's Dollars you can buy stuff to decorate your profile.
I like the idea of seperate points from AP because I feel AP are more about rewards for trying to improve the site, while these new points could be for those people who just want to play a lot. It could be pretty sweet to have a profile with custom backgrounds and stuff like that (that's kinda like MySpace though). And to avoid some of the cheating, maybe beating a game once would get you a few points depending on the difficulty, but multiple times wouldn't affect it. I realize that this wouldn't prevent it, but it's a suggestion.