Quite a few went on first release for very little - one even for fifty quid. I put in a bid of a rather more reasonable sum for the one at Worth Matravers and cunningly volunteered as the key-holder to allow other prospective buyers to see it. I did not get it, although I knew no-one else had inspected it and (since no-one had called for the key), I was a bit surprised.
I later discovered that the mobile operators had bought up a lot of them, sight unseen, in case they found them handy later on.