Perhaps. After a while, there are certain tendencies that are exhibited by guests which can be profiled. Just like a good electrician can tell if the lines in

Perhaps. After a while, there are certain tendencies that are exhibited by guests which can be profiled. Just like a good electrician can tell if the lines in your house are "home runs" or daisy chained based on the gauge of wire and material, a server can "guesstimate" their tip based on the customer. I'm not saying you KNOW this is going to happen but you know if you're getting 15% or 18%+.