It's not against rules for auctioneer to transparently bid on the auction. In my opinion, there's nothing scammy about it either. I asked theymos too, and he agrees with me. I understand the initial reaction may be "ooo, that's scammy" if it's an uncommon auction practice for you. I know it's uncommon in these forums. However, it's a common practice around the world. It's kind of a hidden reserve price.
Are you kidding? It's shill bidding; it's dishonest; and the biggest auction site in the world--eBay--doesn't allow it, and that's for a reason. It's inherently unfair, and I don't care if Theymos agrees with you or not. He's not an auctioneer. He's a forum administrator who tolerates scams by inaction and allowed the forum to become a spam pit because it brings more traffic.
People on this forum have some shady notions of how auctions and escrow are supposed to work. That's why Quickseller has so many supporters for his "self-escrow" scamming. It's crazy that people don't see how dishonest these practices are--but not surprising on this forum, where every other member is a scammer.
The feedback you got is well-deserved. End of story.