[drc]

I think it's fine for Leon to bid, and it's fine for others to bid against him. My only objection would be if others chose not to bid against Leon. As perhaps noted before, it would be someone else's auction Leon would be bidding in, not his own, and he and the other moderators get 0% financial return from sales and auctions that are not their own. The commonly held issue with auction house employees bidding in their own auction house's auctions is due to the auction house receiving a percentage of the final prices.