We need to at least normalize not tipping for counter service. Given the current wage structures and labor laws in the US and Canada, if I sit down at a table and I receive table service, I'm going to tip 15% unless the service was abhorrent. I am not going to tip if I order and take my food from a counter and serve myself (and then almost certainly clear my own table as well), or I buy any other form of product stan…
Most people get 4-5% credit card cash back at restaurants (Amex, Chase, Cap1).
I prefer getting 18-25% cash back by leaving $0.01 tip.
I leave 1¢ so they know I didn’t forget. It saves a lot of back and forth.