Not aimed at you, crazyearner, so please don't take offense, just a general question to everyone who accepts signed messages as proof of original owner:

There's a couple of bucks in that addy, total. If I was selling an account, why wouldn't I sweeten the deal, at no cost to me, by including it, private key and all, in the deal?
Am I missing something obvious?
Again, not implying the crazyearner account is sold, just a general question.