System to support unknown item prices + more dynamic buy/sell prices

This may be not a high priority item but many people have asked for more economic based features, especially for POT's.
Often Chris mentioned that vendor item prices would decrease for having a surplus of the 'same item' for sale. Support for the opposite as well, if possible, that ingredient type items used in items sold would increse in value.
So far I haven't noticed much change, I usually sell my Rusty Swords to the same merchant all the time and I've not seen much change.
With this feature would also come the option for items to have unknown prices for items of special type or higher level items/ingredients.

 

It would be interesting, if vendor prices went up, and down with offer and demand. They actually do for recipes --- I saw it in effect on an Ardoris' carpanter, but never else on other items. Fluctuating prices can market-test loot value, and help to define crafting prices.