Something you "feel obliged to do" is pretty the definition of a cultural norm. People WISH to tip to fulfill the obligation that they feel because of the cul

Something you "feel obliged to do" is pretty the definition of a cultural norm. People WISH to tip to fulfill the obligation that they feel because of the cultural norm. I LITERALLY wish to tip when I go to restaurant. Some of that is cultural norms, some of it is knowing the wait staff is underpaid, some of it is signalling, etc. That in no way takes away from the fact that I desire to give the tip, it only explains why I feel that way.