<p>This item is lassified classified as "<em>Valuable</em>" so will not be used for imbuement since only creature products are used for it. Now about the price above the NPC price probably is just someone trying to make money, at my server you can find a lot of itens items at this situation where ppl people are selling it for a price higher the the NPC price. Tynusiiaa also listed good reason for that.</p>