I hould make you roll insight for this but...

According to what Salvana told you about the ale...

The ale was stolen on the road. Salvana was going to pay for it on delivery, and it was never delivered, so she didn't pay anything, but now she has less ale to sell and thus her potential profits are less. She raised the price of the ale for two reasons: one, to decrease the consumption of it so her current stock will last longer, and two, to make up some of her lost profits. The dwarves from the mountain took a big loss, so they won't make the trek to Winterhaven until the kobold problem is dealt with and the roads are safe. The "rightful owners" of the ale are the dwarves of the mountain. Their closest representative is probably in Fallcrest (Douven's home).

Also note that this is not all of the ale, it's just a small cask; what was stolen was a huge barrel.