I&#x27;m sure it appears that way, because there&#x27;s no way to know what someone would have tipped if you&#x27;d done better.<p>If someone does poorly, I give them a baseline tip.  Probably 10%, but still 15% if I&#x27;m in a good mood anyhow.<p>If they do well, they&#x27;ll get 20%, up to 30% for really, really good service.<p>But the guy next to me might go from 0% to 10% for awful to great service.<p>There&#x27;s just no way to know what a tip means.