I normally don't.
And your idea that tipping ensures good service must be exclusive to the pacific northwest. You don't get your check until after the meal in Iowa. I could see if you're a regular with a history of tipping well though. I gave a 20$ tip at a Hu Hot that I frequent and every time I walk in there I feel like a mixed Chris Christie with food servants.
Not that it really matters. I'm well aware of the low prices allowed because of your shit wages, so regardless of your performace, you get a base of 5 dollars. Tip goes up depending on my level of satisfaction, and it takes a fuckton to piss me off enough to only give the minimum.
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How will they pay for priest/paladin school?
They just raised tuition to cover the costs of repairing the damage wrought by Grom and his savages. YOU FIEND!