Also most 'white' items you get in those sections have 0 gold value .. both restrictions are mainly there to prevent abuse by gold sellers presumably .. however you can 'sell' them to a vendor which is the quickest way to get rid of them if you don't want to disenchant them.

If there's ''Bound'' on the up right on a item description then it can't be sold to other players, and if the item giving by the game to you, not quest, not mission but something like a leveling reward almost all the time it can't be sold to anyone even NPCs