No. I go to the buffet so I can have the quantity of food I want and the part of the food I want. For the latter, I'll give an example. Let's say there's a meat dish that contains the meat, carrots, and mushrooms. I would want to service myself the meat and carrots portion of the dish. If I got the mushrooms, they would be wasted because I wouldn't eat them.
I agree with your point 2.