Isn't that why he tossed them token coins when he bought them and after he gave the pouch of coins to the slaver? Wasn't it so he could claim they were "free men" because he had "paid" them for their services. When he tossed Tyrion his coins (not sure, cuz I couldn't hear him exactly) that those would have to last him a lifetime. ie. he really is a slave, but he is getting around the law by giving him a few pennies? Also, Jorah tossed his money back at the small pit master acknowledging he was actually his slave to be bought and sold after the fight at the big pit? That's the impression I had anyways....could be wrong tho.
