One of the greatest ideas in the gaming industry: Achievement Points. This insignificant number that you can attain from beating requirements in a game has become an absolute obsession. And even worse, it has ZERO value. You cannot sell them and you cannot buy them, therefore it is of NO VALUE. But then again, who is always after monetary gain? This number is our gaming identity. To a gamer, this number represents them to ever other gamer. Cool. "You are what you eat" right? Well, in this case, Microsoft took that idea and said "You are what you play." Ingenious and nothing less.