I am a bartender in a college town. (23 yrs old, in college myself). I make $4 per hour plus tips. Usually, at the end of the night (9:00 - 2:00, Friday and Saturday nights), I walk out with around $200. But, I have been doing it for a while, and work by myself at my request, since I find that more people just get in the way. I have friends that work longer, and get less, because there are three or four of them behind each bar.
I should say that I have my "baiters" too. People that have never paid for a drink in my bar (I just call it my bar because I have been there longer than anyone else, owners included, not because I own it) when I am working, and they tip almost as much as they would pay for the drinks. You gotta learn to manipulate the clients to make serious money...