I was made manager of a my uncles karaoke bar while he went on vacation for about 2 weeks last month, I told him I was curious after seeing a documentary about bar hostesses, and he said what the hell. Exactly as you've said. They're trained to drink, and are commissioned per bottle on top of base salary . What you don't see is 1/3 of them throwing up blood in the restroom. Also, many are addicted to alcohol, and either smoke a lot to stave off the shakes, or do something like speed.