While this a popular comeback for all waitstaff, I had never expressed it or heard it spoken to an actual guest. Well, the server was reprimanded by our General Manager. I felt this statement summarized tipping eloquently. You see, making a living off tips can be as erratic as playing the stock market. Some days are good and you are up.
Some days are bad and money is down.
But ride out the storm and hopefully you will come out on top. Anything more or less than that is a bonus. Everything has a way of evening itself out. So stop complaining and move on to the next table. I feel tipping should be expected when excellent service is given.