>I just don't understand the mentality. Sure, I can see how it can be fun to make an aimbot, and I can see how playing with it for a little while might be fun--or more accurately funny. But I just don't understand why you would routinely sit down with an aimbot. Why not just watch someone else play at that point?

Vindication. The average cheat buyer is someone who gets beat down in the game, and feels personally slighted. This is also why avoiding detection is more important than just worrying about bans. The whole point of modern cheating is to be subtle enough to pass yourself off as a top player, with all the social/financial perks that entails, not to run around in god mode griefing people.