I think that a good way to optimize the item buying/selling process would be to offer the option for players to open their own temporary shop. Players could enter what items they want to sell from their inventories (materials, recipes, equipment, whatever) as well as the price they are asking. After setting their shop, other players would be able to open that shop window and buy whatever they like.
To limit possible spamming or cluttering, this could also be limited to a certain area of the map. Maybe that starting area of Haven that i've never gone back to (unless there's something there that I missed the first time through)?
I've seen a number of other games do this, and I feel that it would work very well for SK. What do you guys think?
I was thinking of this as well. It would be a good way to get rid of overstocked items and players can try and find good prices. If there is a possible way, maybe even sell some items for CE.