Today, I read something which gave me pause. It seems someone came up with the idea of purchasing items on Amazon and then attempting to auction them on eBay at a higher price. If the item didn't sell it was returned to Amazon for a full refund.
I was almost shocked until I recalled a relative telling me about a contemplated purchase of a particular men's shirt, manufactured in the relative's home country. It was a little pricey and he wanted to wait to see if it would go on sale. Sure enough, within a few weeks a newspaper advertisement for the major department store touted a thirty percent off sale on all men's shirts. Back he went to the department store and found that this shirt had been re-priced and re-labelled with an original selling price of--you guessed it--30% more. The sale price just put the cost back to the original price.
Ethics can be in short supply with vendors and purchasers, both large and small.