80% of the community fills it with random bullshit. Their favorite videos, music, stupid userbars and shit like that. This includes signatures with little graphic rectangles. I can understand if you want to show off your work, but why do people ask for some? We see your username already, we don't need it jazzed up with whatever shit you decided to include in it. Just wastes space.
Then there's the faggots who put respect lists, goal lists and anything semi-related to those. You'd look less retarded if you didn't go about life thinking everyone cares about you or your interests/goals/friends and what have you.
By the way, before you post the generic comment 'You can turn them off!>>!>!'. I already did.