I used to deliver pizza when I was going to trade school. I got a tip from a guy that used to date the pizza parlor owner's wife, with the understanding that I tell her how much he tipped me. It was a large tip for the time. The amount he gave me I would have taken out a newspaper ad to tell people!
At that same job I had a guy that I was in class with tip me a nickel. 5 cents... I felt insulted.
Now I make good money doing commercial/industrial heating and cooling. During the Covid thing the local Texas Roadhouse was offering raw steaks for sale at reasonable prices so we ordered $100 to grill. When I picked it up the curb guy was filling out the order on the iPad he was using and asked if I was wanting to add a tip. I said no but then realized how I had been in his place many years ago and how I have been blessed now. I told him I had changed my mind and I gave him $10 for walking the steaks out to my car. His face truly lit up.