How would reverse amazon know to price your junk item extremely high? Seems like you're just losing a whole bunch of cocaine. How would reverse amazon know to

How would reverse amazon know to price your junk item extremely high? Seems like you're just losing a whole bunch of cocaine. How would reverse amazon know to ship a potential illegal firearm buyer your teddy bear versus one of the others in comparable condition they have in stock? I imagine you could set up some elaborate code to make side arrangements, like someone agrees to wire you money and you communicate to them a very specific pattern of damage to look for in a used item so they know which one to buy, but at that point why not sell direct? And people claiming not to have received items they purchased is a common problem to all online sales platforms.