I think you just answered your own question without knowing it:
Maybe a (15%) service charge should be added, but if this happens, the server will not be as attentive and just get by on that.
Tips = incentive for good service.
I currently deliver pizza, have been doing it for a long time, and I pretty much know who tips and who doesn't in my area. Those that tip always get their food first unless I have to really go out of my way to bring the non-tipper their food last.
If someone who doesn't tip orders, and then someone else orders that does tip shortly after, I will almost always wait on the tipping order to come out before leaving, regardless of how long the non-tipping order has been ready.
I could go on forever about different scenarios and all that, but I don't feel like writing a novel today.
As for the employer being forced to pay minimum wage, it wouldn't make much difference. In fact, if they paid minimum wage and the wait staff didn't receive tips, they would probably go work somewhere else and the restaurant would have no wait staff.
Most wait staff average well over minimum wage when you factor tips in. I average $15-25 an hour delivering pizzas on most nights, but my actual wages are only $6.00 an hour (I think $6.55 is minimum in Louisiana).
I'm sure wait staff's job is a lot harder and more stressful than mine too. My job basically consists of taking phone orders, working the oven, driving around in my car listening to Pantera, and usually having less than 30 seconds of face to face interaction with the customer, and if they don't like the way their food tastes or whatever, I'm already gone by then, so complaints usually consist of the customer calling the store and complaining to the manager, whereas wait staff usually gets to sit there being bitched out and judged by some pompous ass that's blaming the wrong person for their steak not tasting just perfect.
Wait staff (good ones anyway) are constantly running around all over the place, making sure everyone's happy at all their tables, having to put on a fake smile and pretend they're jolly and happy even on their worst days, etc.
Those people really bust their ass, and deserve every cent they get. If the employer were to pay them everything (again, most average well above minimum wage when tips are factored in), then menu prices would have to skyrocket to compensate, or go out of business.
<message edited by Methais on Tue, 03/10/09 2:42 PM>