above shows merchant value as being 15pp.
usually my cost buying items from npc is not far from the merchant value so I assume that it is meant to be what npcs sell items for, not what it buys item for.
that being said this item was up on Tranus Ironstove in POK for much more than 15 pp listed.
On my alt lvl 71 with 380 cha it was selling for 78pp 7g 4s 9c.