I never tip over and above autograt. If you've taken the decision away from me, you lose the upside as well as the downside.

It's cruel to leave less than the customary amount when service is adequate. However, I resist lobbying by service people to inflate the customary amount. A 15% tip on the food portion of the bill is customary, with some extra thrown in if alcohol is ordered, but certainly not 15% of an expensive bottle of wine.

I tend to leave about 20% of the total bill including alcohol, but I cap it at around $30/person. I consider that overtipping, but I have the means to overtip and I dine out frequently and have relationships with the staff. Only once have I heard a complaint about a $120 tip left on a dinner for four that came to about $1100 with expensive wine. I never returned to that restaurant, but I suggest that the waiter involved seek a new career, perhaps neurosurgery.

QL