Because of how long he's been enslaved in the Vandros family, it would actually be quite difficult to trade him over properly to another family. Even if they hard broke him, they would be essentially trying to unbreak his old bond to form a new one, and it would have to be a hard breaking to accomplish this. Orion knows this, and does not mind the idea. . .So. . . .Yeah, he's not evil, but he will go to great lengths when it comes to slaves he really wants. 

You're right too, his skill set is mostly unknown, and most would assume that he is your general hard broken long lived vampire, which as you say, isn't worth too much. 

I understand being insulted for your character. It happened at the beginning of an RP for an assassin character I had. The other character(My partner's character) somehow knocked the blade away from his throat when I know for a FACT that it was impossible. I brought it up with my partner, a change was made. But it was just that moment of my mind going "No! No way! Rei is way faster than a drunk half asleep human!" I'm glad you get the differential thought between his real worth and his public worth :P

Erik. . . . .Yes. . . . Has very little slave value. . . .However he is a collector's item that is nearly priceless at the same time. Most in his position are killed in the line of duty, or find a way to kill themselves so that they can't be hard broken and forced to divulge their secrets. So, to the public, a 1-2, maybe, and to a collector of rare slaves, a 8-9. He's like a rare baseball card, he only has worth to those who seek rarities like him.