If you consider the current economic climate and the fact most people are trying to better control their budgets it's easy to understand why restaurant servers' tips have declined [1]. Still, diners, drinkers, spa junkies and patrons across the US customarily tip 15 to 20 percent for good service. And that adds up to a whole lot of dolla dolla bills. Can you guess how much Americans tip each year?

Source [2]