I get that, and I agree. I just literally didn't understand what your first line meant. I think I get it now, though.
I'm guessing it means the same as "If I just grab all the food on the entire table and put it on my plate, I "win!"
I didn't like how they presented it either, and I HOPE that they meant you "win" when you pay a fair price for the meal and the restaurant makes a fair profit, not that you only win if you cost the restaurant money for your share.
Other than that, though, when you take the win/lose thing out of it, they do have some good advice for eating at a buffet. Not the most important advice in the world, but I thought it was fun. I think they were trying to be cute more than actually being invested in what they were saying.