The thing you Brits are missing with the US tipping custom is that in a lot of states certain jobs (like waiter) can pay less than minimum wage with the assumption that the workers will get roughly 15% in tips. Theoretically, in most of these states, the employer is supposed to make up the diff if tips fall below that (very theoretically).
http://www.dol.gov/whd/state/tipped.htm
In other words, it's less of a "thanks" and more of a semi-voluntary surcharge that comes out of the paycheck of the waiter if you stiff them.
Heh-- my British father in law (OT: totally workaholic) still can't bring himself to routinely tip 15% in restaurants, and he's lived in the US for a couple of decades now.
http://www.dol.gov/whd/state/tipped.htm
In other words, it's less of a "thanks" and more of a semi-voluntary surcharge that comes out of the paycheck of the waiter if you stiff them.
Heh-- my British father in law (OT: totally workaholic) still can't bring himself to routinely tip 15% in restaurants, and he's lived in the US for a couple of decades now.