An an all-you-can-eat buffet in Chengdu, China closed its doors after just two weeks because customers ate too much and also cheated, causing the owners to go over $100,000 in debt.
From Matador Network:
Hoping to attract a loyal following, the restaurant allowed diners to buy a $25 all-you-can-eat card giving them unlimited access to the buffet for an entire month. Upon learning this, Chengdu residents lined up to take full advantage of the offer, forming lines in front of the restaurant each morning. After gorging themselves, the diners decided to optimize their investment even more by passing the card on to friends and family, creating utter chaos inside the dining room and sending over 500 people through the buffet line (multiple times, of course) each day.