It's not entirely true that they spend all their money on drugs. Perhaps 50% of them do that.
I've never messed around with prostitutes, but I have an aquaintance who does it all the time. He once threw up on a girl in the shower as she was giving him a blow job. He's really abusive to them.
An old professor I know fell in love with a hooker. He didn't reallize it until she got married. LOL