Now, I'm not talking big ticket items here, but I buy stuff all the time to resell for ten, twenty, fifty, even a hundred times my money. Ten is the minimum!
Rest assured that revealing "what I paid" is not part of the ad when it comes time to resell! (I do wind up spending more on storage than the things cost me. Also on eBay and PayPal fees.)
I imagine if someone made those kinds of markups on pins, you guys would swiftly crucify them!