Many NEEDED items can't be sold, even after they have been used. And others, will always only be worth just a couple of gold or less. If you have used it, and they wont buy it from you, there is no reason to keep it. If you want to save it, just in case you think I am completely wrong, just drop it on the ground, because Quest items dont disappear (like normal Items do).
I can't imagine needing gold. By the time I finish chapter 2, I had over 100,000 gold.
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