OK, this is where you make your money back.
Think of all the times you've been to some high-faluting restaurant and been charged £26 for what is, essentially, an omelette. OK, it may have had a truffle waved over the top of it but it still tasted, decidedly, omelette-like.
Well, prepare to redress the balance. The all-you-can-eat restaurant gives you the chance to eat your bodyweight for a fixed price. They may give you a small plate (which will require multiple reloads) and the staff may glare at you like you're taking food from their children's mouths (in some instances this may actually be the case) but who cares... it's time to get some value.