If you go to a restaurant, you will more than likely tip your waiter or waitress for good service. You'll tip a bartender, a cab driver, maybe even a delivery person. Have you ever thought, though, of tipping your tattoo artist or piercer? Do they expect a tip? If you do tip, what should it be or how much?
Gratuity for a tattoo or piercing can't really be determined by the percentage rating most use for tipping a restaurant server.
Even ten percent of a $200.00 tattoo would be a very substantial amount just to give as a tip. A tip, instead of a percentage, should be based on (1) how much you can afford and (2) how much you feel it is worth. A $5.00 tip would certainly be accepted more graciously than nothing at all.