What is the difference between a game and something that simply has a point system?
I believe that games offer a belief of escapism. When you're playing a game, you are leaving the problems of the physical world to work towards goals in an otherwise imaginary landscape. While in this landscape, the escapism is few and far between, because the game still fits within the rules that are prompted by our real world and society that we exist in, pitting us against a computer, fellow gamers, or even oneself to get to the highest score possible be it kills, progress, time to achievement.