1. Two studies show little relationship between quality of waiter service and size of tip.
2. Hotel bellboys can double the size of their tips, on average, by showing guests how the TV and air conditioning work.
3. Tipping is less prevalent in countries where unease about inequality is especially strong.
4. The more a culture values status and prestige, the more likely that culture will use tipping to reward service.
I hate tipping, I think in this day and age we should just pay people propley rather than guilting others into doing it.