Tipping is mostly fuzzy, partly altruistic and a little non-fuzzy non-altruistic (superrational equilibrium keeping the restaurant in business, etc). However, if the value of tipping is depressed by you not wanting fuzzies and having better methods for altruism, and you need the money, go ahead.
Bang, a relevant link that expresses my opinion!
Tipping is mostly fuzzy, partly altruistic and a little non-fuzzy non-altruistic (superrational equilibrium keeping the restaurant in business, etc). However, if the value of tipping is depressed by you not wanting fuzzies and having better methods for altruism, and you need the money, go ahead.