Cloud of Death's first proof is unfair, as the p.e. phantom is worth 60 keys, not 50. The fact that it is duped does not automatically lower its price by 10 keys. This is quite clearly pedantry, as there is a lot of dispute as to whether or not duped items should be sold at a lower price, and it is up to the buyer to make that decision. Usually, the buyer will try to exploit the fact that an item is duped to try to get a lower price, but conversely, if they are selling, they will create a double standard and try to hide the fact that their item is duped. Therefore, the price of the charmers should really be 60 + 20 = 80 keys.