Or that the value cannot be verified before purchase.
Selling really bad fakes for the same price as real (as the price is known before purchase, otherwise it's called theft or deceiving) is not going to work.
In this case cheese: you will never buy again if you find it tastes horribly different from what you expected.
"Batches 24-30 have produced an uptick in hospital visits! Producer: prove that it came from us."
"We scanned them and all of them has your chips in their bellys."
Ok then let us now spend the time to do further analysis and either admit our fault or find the rat and fuck them to death.