Do you think it's morally wrong that my work colleague plans to sell his PC for more than it's worth?

He seems to think that I'm being negative or overly weary about his proposed sell of his PC at way over what it's worth, but part of me thinks it's wrong. The main cause of this is that he wants to sell it at work to people who will think this is a good deal and probably will buy it at its exorbitant amount. What do you think? Is this wrong? Or if people are stupid enough to buy it does it matter?