The only reason they will "let you undo it" (buying something for $500 instead of $5) is because goodwill is hard to buy and doesn't cost them anything in this

The only reason they will "let you undo it" (buying something for $500 instead of $5) is because goodwill is hard to buy and doesn't cost them anything in this case. It isn't like the company is "being moral" or anything like that, it's just marketing. Same with eating the cost here. They might have some legal recourse to get the items back or the money, but at the of the day, some amazon analysts are doing a math problem and trying to determine if they will lose more money (from bad press) than they will by just eating the cost. Morality doesn't come into either of these situations.