This is sort of funny to me, because until I read these boards I did not know that tipping less at buffets was the "norm." I just figured it's a restaurant, someone IS waiting on you (bringing drinks, clearing plates). I just thought that you should tip like any other restaurant.
Let me add that the ONLY place I have ever, ever eaten at a buffet restaurant is at WDW. Until I read about it here on these boards, I had never even heard of Golden Corral (and have yet to ever see one in person)! The only buffets around me are Chinese lunch buffets. So, maybe that's why I thought that way.
What I don't understand is why someone would tip less to the server at the Crystal Palace breakfast than they would to the server at Norway Princess breakfast.
Just because they carry the food to your table at Norway and you get it yourself at Crystal Palace??
The only dinner buffet in WDW we ever do is Cape May Cafe. We tip 20%, just like any other restaurant. In fact, we have had some of the best service at Cape May. The server brought us crab legs, pitchers of beer, cleared our plates promptly-perfect service. Honestly, I can't think of a time we even had "average" service at Cape May CAfe.
I guess everyone is different, but the only place I would comfortable tipping 10% for good service is at a bar (no food, just drinks).