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Jim from Boston, I will consider your point about condescension. Maybe I should bring both cash and beer.
I know there are cultural differences in different regions. It seems the northeast is heavier on tips than the rest of the US. So be it. My outlook is that the money is small for me and probably big for the person receiving it, so I see no reason not to tip very well. In restaurants I tip over 20%. If that sounds like a lot, the difference between 18% and 20% is often a dollar or so. Who needs the extra dollar, the server or I? The server, for sure.
We don't often order food for delivery, as we see it as a luxury, but in my neighborhood, it's a booming business. We did so this weekend. Our order was $60. I tipped the delivery man $10. He was very grateful. Maybe I'm a fool, but I bet the guy put the money to good use. If I can afford that kind of money on food (occasionally), let the guy bringing it to me have a little of my fortune. The restaurant isn't paying him a complete living.