Sell price of map fragment is excessive
With a PC not planning to do the Rolf quest, I offered a map fragment for sale in the black market. The shopkeeper offered me ~12,000 gp!
For comparison, the Sword of Nonnak was worth only ~5000 gp.
Even if they're artifacts, they don't do anything on their own, so I suggest the sell price should be quite a bit lower, if it's possible to separate it from the buy price.