Firstly.... TWENTY?!? Really?!? That can't be the going rate... can it? Seriously?? That's gotta be for bottom-dwellers or something.
(Who are you doing business with out there? LOL Kidding!!!)
Secondly, I think it's the taking without permission, or doing the forbidden, that is a large part of the motivation and thrill for them. When it's allowed, it's probably not as fun.
For them: Free and offensive > paying and voluntary
Heh...I watch 1975 TV shows....