Oh, this convo again.
I'm actually glad most people don't tip well, and I'll tell you why. When I go to a bar, and say my first round is $11, I'll leave the bartender a $20 and tell him to keep the change. He appreciates that because it's not the norm, and returns the favor by not only serving me quicker than the other patrons, but I'll typically get free drinks and shots throughout the night, the value of which well exceeds the $9 I gave him to begin with. So it's a win-win.
With restaurants, I always tip 20% even though I'm not likely to ever see a returned benefit from it because I used to be a server and know what that grind is like. I've had 10+ jobs, including now running my own law firm, and serving is still the hardest, most hectic job I've ever had.
What you guys who complain about tipping don't understand is that the margins in restaurants isn't all that great. And they're in it to make money, not to maximize savings for customers. So if there was no such thing as tipping, instead of paying $15 for that burger and being expected to tip your server $3, the restaurant would just make the burger cost $18, and you're paying it anyway. And if that were to occur, the server REALLY has no incentive to give you good service, because his "tip" is built into the price of the burger already. So he's getting his whether he refills your drink promptly or not.