Its because your argument fundamentally does not hold water. "It would be too hard for manufacturers..." just is not true. You are trying to tell us that the on

Its because your argument fundamentally does not hold water. "It would be too hard for manufacturers..." just is not true. You are trying to tell us that the only way to price something is printed on the original box (not even the product! just the box) and that it would be too onerous to expect them to price at each location accordingly. Are you really trying to insist that a sticker is too hard? Too onerous a task?