We've got Pizza Hut here. who removed the salad buffet from the menu because some cheapass families from Indian/Pakistan/Bangladesh (and later Chinese families when they saw them doing it) were raiding it every day, ordered one salad buffet for one. The interesting thing is that It was not a "all you can eat", but only a "one way", and bowls were obviously sized so the business could still make profit. Now image search for "pizza hut hk salad tower" and you'll understand why they removed it from the menu.