Are you a social dancer? :D Salsa dancer for over a decade and event (Congress/social) organizer for a few... I know exactly what you're talking about!
PS - the issue is that many social dancers want to dance over being social, and alcohol detracts from it. People have jobs and want to pay to contribute. We ended up settling on a cover charge that comes with food credit so people can booze up if desired, and buy water/snacks if not. Win-win.