I tip per performance while eating. If they are shitty they get a shitty tip, still a tip though.(how busy they are plays a factor) For drinks usually $1 per drink but I always get bottled beer.
I've heard of bartenders getting $2-$4 an hour. I've also dated one and she could bring home over $400 on a good night. That was for about 5 hours of work.
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