Not sure if this is true, but it makes sense. I had read somewhere that in the old days the tip was paid up front to "insure" a good experience, hence the acronym for TIP "To Insure Promptness". Personally I have found my service to be good to great most of the time at many of our local establishments and I tip accordingly in response. Maybe because I choose to leave a good or fair TIP the servers remember and continue to provide a good service and experience for me. At the end of the day the server will command the TIP I feel is appropriate. If the service is poor, vote with you wallet and don't patronize that business. Or better yet let the proprietors know.