While I understand the fear of that, I can go to the store and see hundred of food products that has a "if not completely satisfied, send the package back with a recite and get 100% of the money back". People could buy it, eat the food, and then return the package to get the money back.

Have anyone heard of a food producer that gone bankrupt because of their 100% satisfaction guarantee? To my understanding, the amount of people who would go through such policy and send back the package is so extreme few that the numbers get lost in the sale statistic.