I do not see a problem with flippers who set up a bike and resell it. I bought a stereo receiver the other day for $10, I cleaned it up and checked it out and will replace a couple of parts. I bought it for myself, but if someone took it to a repair shop they would have charged them $40 for what I did to it, so if I was to sell it for $50 who would I be ripping off? Whether you find something you want or not tends to be the luck of the draw, I guess. However if they allow the employees to buy stuff, they should not have a sign saying they don't.
My original question was because when I have donated things and I never see them in the store, of course I do not donate things because it's cheaper than taking them to the county dump either so they may just go to the floor and out the front door.