While I agree that the suggested tip percentages are getting out of hand, I personally refuse to follow those and I would be surprised if most people did. I tip the same as I ever did: 10% (or less) for bad service, 15% for decent but unremarkable service, 20% (or more) for good service. There's absolutely no reason to increase the percentages one tips just because the people writing the POS software are putting in crazy values.