I'm sure it appears that way, because there's no way to know what someone would have tipped if you'd done better. If someone does poorly, I give them a baselin

I'm sure it appears that way, because there's no way to know what someone would have tipped if you'd done better. If someone does poorly, I give them a baseline tip. Probably 10%, but still 15% if I'm in a good mood anyhow. If they do well, they'll get 20%, up to 30% for really, really good service. But the guy next to me might go from 0% to 10% for awful to great service. There's just no way to know what a tip means.