No, it's not. It does not publish the sales prices for everything listed. It publishes the sales prices obtained by a group of hyper-aware extremely-online people who are mostly trying to get a rock bottom deal.
I mean, I'm one of those people, so I get it, but still.
And, it only publishes some of the deals obtained by those people. I'm certain there are people on this board who've decided not to post in ROFR because they did not get a great deal, and don't really want to advertise that. Given the way a few posts have been Reply-Guy'd with "That's not a good deal, actually" I am pretty sure I wouldn't.
I thought that's what Closing Time was for.
In any event, if I wanted to know what the overall market was, I'd look a the average sales prices that Fidelity and DVC-RM publish each month. One of them (I think Fidelity?) helpfully breaks it down by contract size ranges.