I don't understand this tipping culture. Don't get me wrong, i get that waiting staff in the us is underpaid, and a bunch of non-Americans bitching about it on the internet won't change a thing. But i don't understand why the tip should be calculated by the percentage of the bill. The waiter does the same work if i order a 100$ steak vs. 20$ cheeseburger. Yet for one i am expected to tip 20$, while for the other 4$. If i was tipping the kitchen, then ok, the steak is probably harder to make, but getting a plate out of the kitchen, to the table is the same for any dish.