A perennial gripe about tipping is that it’s usually based on value of goods, rather than value of service. Pouring a $7 glass of wine takes exactly the same ef

A perennial gripe about tipping is that it’s usually based on value of goods, rather than value of service. Pouring a $7 glass of wine takes exactly the same effort as a $14 glass of wine, but one earns the wait staff double the tip.