Also, you forgot The Generous Elusive who sometimes give $20 on a $30 bill and don’t even expect sex in return. Or do they?
Grandma used to double the tax, so yay, 12%? Ugh. But she lived through the Depression and didn’t know (until I told her) that servers typically get 1/2 minimum wage and depend on tips.
The tipping weirdness extends beyond serving. I worked in flower delivery in one of the wealthiest communities in the world. One delivery of $1700 in flowers took nearly an hour to hand-place each item throughout the house on special crystal saucers. No tip. Then another guy gave me $40 for hand-delivering his daughter’s $12 prom corsage. No rhyme or reason to the whims of the wealthy!!