Perhaps a bit harsh, but things like this are not any different then the people selling 'gold as the best investment' and then selling you gold at 15% above what you can get it for just about anyplace else.
There's nothing wrong with that, IMO. Gold is less saleable than Bitcoin, so it's reasonable that you'll get higher prices for the people nearby you. If you want to buy gold at the market price, then be responsible and look it out yourself.
I called them victims because there's someone who takes advantage of them.
But does he, really? If you look at it objectively, there's a buyer and a seller. The seller sells at price X because he believes his thing is worth less than X, and the buyer buys at price X because he believes it's worth more. If either of them thought the price was inappropriate, the trade would not take place. Therefore, both need to be happy with the rules, and there's no "item description" that the buyer is unaware of, to consider it a fraud. Everything is transparent.
Both are equally guilty for whichever outcome.