It's immoral to drive up prices of your own auctions.
Colin is auctioning off some old family heirlooms that have been gathering dust, and the first item is up for bids.
Colin wants money for his item.
Colin lets the auction go on without interference.
Colin has a friend bid on the item to drive up the cost.
People bid on the item, and Colin gets some money for his item.
The auction organizers find out about the scheme and ban Colin from any more auctions.