The dive bars are busy, but the drinks are so cheap there is not much profit to make. If your skill and drink list is good enough, you can tend at a classy place. These are usually almost empty, even if it is supposed to be a "hotspot". The few drifters who do show up sometimes never make it to the bar to ask for a drink. I tried to invite over a few famous sims before. One out of 5 will actually stay and order a drink, so I can give them the one I made specifically for them or one made with homegrown flame/life fruit. You do get famous pretty fast, but with the actual bartending I really have not had much luck so far.