I'm failing to see the negative in your situation. Any system could implement the same policy as MLS and delete transactions that didn't close.What could possibly go wrong with releasing the data? Mr. Smith sells his house in a normal market. Asking $789,000, sold for $750,000. That information is then released by all sorts of sources to the general public. Mr. Smith's house has NOT closed. The buyer, for some reason, has to pull out before closing. Mr. Smith gets a mutual release, and needs to put his house back on the market. Now, everyone knows, including the general public, that he only got $750,000 and now has his back against a wall, so they offer $730,000. On the MLS system, if a deal falls through, the sale price is deleted from the system. Only agents with a good memory know it previously sold for $750,000.