I was struck recently when listening to music over at The Sixty One how if you add levels and experience (reputation in this case) to anything it instantly makes it infinitely more addictive. I think there is something about the of gaining and moving up levels, a sign that you are doing well, that at some deep level reinforces the action and compels us to do it more. I think that anything that incorporates levels of achievement has an amazing power to manipulate the actions of the people that interact with it, even if that ‘level’ means absolutely nothing.