My customer base would disagree with you. These aren't used cars, they are animals. A reputation to do the right thing in every transaction is what its all about grasshopper.
So working at Petco, we have a cage with about 7 or so ball pythons. They are on sale right now for $50. You think i have some sort of duty to remove the pastel from the enclosure, bring it to the register and say "charge me $250 for this" ???