I am a bartender too. If I ever get tipped less than $1 per drink, I make sure not to serve that person again. Most bartenders do not get paid by the club/ bar, and a tip IS NOT A TOKEN OF APPRECIATION!!! IT is how bartenders get paid. And for that ass that said he goes around to diffrent bartenders, so that they do not notice that he does not tip - it is usually noticed!!! Most bartenders hava a system to notify the other bartenders who the non-tippers are (usually pointing them out to a barback or security). Also, keep in mind it is not mandatory to serve you! A bartender can refuse to serve you if you do not tip.