I will address the former when I have a brain to do so. As to the latter, for a collector, the hard breaking would not be crumpling, it would be cleaning and preserving the slave. It doesn't matter that Erik's mind would be crushed, because it's how other humans look at the owning that matters. Even as a broken blank slate, being able to show off this "Once proud leader" as a collectible would be the prize, not the actual state of his mind. Who cares if he still thinks for himself, this man/woman here has him, and has tamed him. What a catch! Things don't have minds, and slaves are things, so a thing with a broken mind does not lessen the value of the thing when it's the possessing the thing that matters, which in this case is what would matter. Having him broken and subservient would server the human's ego. "Look at this amazing strong willed thing I now have under my boot, and polishing it too! Look at that!" So. . . . Yeah. . . . . Humans are f'ed up. And I have no brain. . . .Ish over der. . . .Collectin' flies :P 

Oh, and, in this analogy, the person selling the stamp knows how much he could get from a collector, so you would pay out of the nose for that stamp, and if you tried to turn a profit on it there is a good chance he could find it cheaper somewhere else and you would be left with a stamp you may never sell, or if you do it will be fore less than what you bought it for. Too risky in my humble opinion. . . .

I must to sleep now before my last brain cell goes on strike. G'night, and sweetin dreams. . . . .