“Okay, you pay your waitresses slave wages, but I’m the cheap one. Got it.”
I'm old enough to remember when 10% was the standard tip. I've had a lot of people tell me that it has gone up to 15 - 20% because the cost of living has gone up. I'm not a math major, but if the cost of what I'm buying goes up - the cost of my 10% tip also goes up. That equates to a built-in cost of living increase.
I was also taught that TIPS meant "To Insure Proper Service". If I don't get good service (with a good attitude) I don't tip.