Umm so if you had an uber scroll of leet mage awesome , but you only play barbies , you would keep the scrol in your inventory , just to look at it some times ?
It will work like this , lots of scrolls in the AH or trade forum , you have some you dont need , you swap it for one you do need .
People who run the most , will have the most stuff .
Nobody is gonna keep an item in their inventory that they have no need for when they know its tradable for something they do need .