For reasons I won't go into, I'm not a drinker, so I don't know the answer to this question. But how many drinks would you buy in a three hour visit to a club on average? This'll give me an idea of the kind of revenue a bar owner can expect from one person. It's probably wide and varied, but if enough people answer we could get an idea. I usually get a diet soda of some kind...and have one refill...for a total of 2 drinks in a night.