I heard a Freakonomics podcast that covered a study that concluded, if I recall right, service doesn’t play a main factor in tips. Seems counterintuitive because it should, but size of the bill and churning through customers, people leave about the same % overall regardless.I'm simply pointing out that there are circumstances where not leaving a gratuity is perfectly acceptable. You made some strong statements about the character of folks that do not leave a tip at all. I'm simply pointing out that is ridiculous, some servers do NOT deserve a gratuity based on service AND/OR food quality.