Since the AF Draft, I had a conversation with a couple of realtors and asked them how they see concessions and value (which is what the draft is asking us to do). Surprising enough they said that the 'buyer paid closing costs' in some segments of the market have become baked into the cake and despite presenting the logic of $4$ to the realtors they pretty much shake their head and see it as a 'cost of selling' in a down market. In other words, "Mr. Seller is told that the way to sell your home is to pick up the buyers closing costs."
I've always treated concessions as $4$, looking to the net of the seller. So I guess the question becomes, so what is the Market Value of a cash transaction? Should there be a positive adjustment? Would it typically be what the seller would have typically eaten had he sold it with conventional financing?