Sure there are instances where people will sell their accounts plus their private keys however trying to scam with a trusted account is a gamble at best and a gamble with small potential rewards and high risk and a generally small success rate. I would call the EV of buying a trusted and/or a default trust account to be negative by a long stretch.
It's impossible to calculate without real, actual, values. The value of the default trust account to someone who's going to be walking away from the forums forever (for any imaginable reason) independently of whether they find a buyer is whatever they can get for it. Ie, if you know you'll never use it again, then you've got every incentive to sell for whatever you find someone willing to offer.
It's impossible to say what the value of something is/isn't without knowing actual details of a given situation. Anyone who says otherwise is engaging in mere speculation---this can be fun, but it's not solid argumentation.
That is why I wanted the OP to start selling trust to see how it would play out. I want those real, actual values. But I'd agree, buying accounts is negative EV for the purpose of scamming, trust perhaps not though. Thats why I think selling accounts is more "acceptable" than selling trust. While you are correct it is more or less speculation until people start trying to sell trust, you can make certain assumptions. I've asked people to name a single proven instance where someone has purchased an account or trust to scam with. The fact that in Bitcointalk's history, no one can point out let alone one instance, there must be a reason why its not done.
I'd be happy to post my list of calculative analysis on the matter, but people don't seem to like my 4 page walls of text.
