In addition to the enforcement issue: From time to time people have asked me whether they could sell their accounts or use them as collateral because they have an emergency need for money or have come on hard times. I'm not going to tell them they can't do this. It's your account and you can do what you want with it. I find it pretty distasteful (it's like selling your identity), but the act of selling your account does not itself hurt anyone else, and in fact scams via account sales are very rare.
Selling accounts hurts trust, thus hurts
everyone.
What's the point of having a trust system, when accounts with positive trust are bought & sold, regularly, right here on the forum?
@redsn0w: Please understand that most here know how to read, and theymos, in turn, knows how to write. No need to interpret what he wrote, or to embolden parts of it like a Red-Letter Bible.