Tips are optional.

Often, people who came up from the working class tip because they recall crappy pay, poor conditions etc when they started and appreciate my hard work with a tip. Others do not look at it that way and have your own thinking.

Im okay with either. I get it. Many of my patrons are unemployed due to retirement, living off interest and savings. They all tip. The young up-and-commers hardly tip. I think it's because the young had a different kind of life (ie easier) than the older retired generation.