I think the BST posts are not editable at all after posting, to keep someone from purposefully changing the term or the offer after a deal has been made.
But... there is always the ability to add an additional post in the thread, which davis certainly knows how to do.
My opinion is "let the buyer beware" and if a user wants a straight out trade of a 9800 for a 9700, so be it, that's the marketplace and if the marketplace will accept the deal, the two parties have every right to make that deal.
However, I think other users also should have every opportunity to point out that it's not exactly an even deal. The buyer can make their own decision.
Since davis' argument is with how we run the BST section of the forum... it's a closed subject. We aren't running this like HoFo and CB. Period.