Whenever I find a new item (so a couple times per minute), the name of the item appears briefly with a "price tag" showing a number of gold coins. I thought it a bit strange that all these mercenaries hadn't even removed the tags from their equipment, but I was surprised when I found a shop and tried to "return" the item for store credit, they didn't offer me anywhere near the amount that had been on the price tag.
So if that number doesn't tell me how much gold the item is worth, what does it tell me? Is the sale price some percentage of the value that is shown?