> "Tipping isn't obligatory" -- yes, it kind of is. Do you think that if they received, let's say twice the salary Google intends to give them, they wouldn't "

> "Tipping isn't obligatory" -- yes, it kind of is. Do you think that if they received, let's say twice the salary Google intends to give them, they wouldn't "expect" a tip anymore? It's up to you whether you want to tip or not. If he "expects" it and makes it known, give him a lower rating.