People make pigs out of themselves at buffets where I live. Piling their plates up the ceiling (and often not bothering to get clean plate on top of that). But you know, the only thing that could technically be illegal in a buffet is taking food home. Eat all you want means just that. Or else you charge breech of contract and false advertising.
OH I ALWAYS get my money’s worth at buffets! I’m a little out of control. A little gluttony doesn’t hurt anyone once in a while.