They must be rare for them to be that much.... actual theatrical posters, or mayhaps reprinted lithographs rereleased in limited edition. It's no less pointless then spending the same amount for an animation cel, which is rerpoduced anyway.
I thought the Animal was ugly to begin with, but after a while, it looks kinda cool. Animal is tricky to draw to make him look just right, and since it seems he's more of an abstract artist, it looks pretty darn cool to me.