Something's up with the age to serve, because here I think if I read correctly, you had to be 17 to take bar-tending course. Not that I'm worried, as I'm 21... but still odd since drinking age here is 19.
I know over here at a nightclub I frequent, the 4-5 bartenders always get lots of attention, so I'm positive there's some late night booty-calls on after hours
Can't say I'm against it
As for dealing with the rowdy people, the bouncers take care of that shit. I've never seen a bartender have to deal physically with a drunk-ass punk wanting to stir up the shit. Which is why I'd never want to be a bouncer...
But the plus side of course is bartenders know other bartenders, and you make good connections... (quick entry to the club, free drinks, etc.)