pretty sure they would see their profits dwindle if they couldn't capitalise on the drunk and horny market. most men aren't violent or troublemakers, but I'm sure there's a couple - and don't forget some men need a bit of liquid courage to even visit a brothel. Quite often in the right circumstances it can make a session easier for the girl if the guy is drunk and his equipment doesn't work, or even more-so if they fall asleep!

you shouldn't be too quick to paint everyone with the same brush, alcohol affects us all differently