Constructive suggestion, but if this system is to prevent fake offers and whatnot, isn't your auction house system flawed?
The same concept of using friends and alts to bump up the current bid can also be applied in your proposed auction system. For example, the seller sets the "secret bid" at 90m for a rare item that is usually worth 70m and encourages his buddies to bid all the way up to 89m. Another genuine buyer that really needs this item and is unaware of its worth goes on to bid 90m. In this case, the seller has hoodwinked the buyer into paying 20m extra.

P.S:-
The whole "fake offers" concept is so messed up. Anyone around that is still doing this to take advantage over desperate buyers should be ashamed of themselves.