A valid unsold is proof for lowering because it indicates that the item cannot sell at that price. It just quicksold at this price, which contradicts that somewhat and given that the listing is unbumped/relisted it suggests that there is some reason that one isn't selling. Maybe keep an eye on the 0.55 sellers and see if any of them do manage to sell or not. Two from hatbot in your suggestion body and bodomi has one listed