You could get away with something like this in EVE. In that game, it's standard business. Spot a mistake on the market, buy it, chortle, post brag message to forums with screenshots, everyone laughs, the end.
This community is too small for cutthroat market dealings. It would be far better for everyone if mistakes like this were repaid with some advice and kindness.
Obviously most of you are douchebags and would stab your own mother in the throat for an extra slice of pie, and that's just what we have to live with, but there's no reason for admins to be part of the problem.
If you want to be a part of the problem: fine. Welcome to the internet and all that. But don't be an admin, then. Problem solved.