Since the listing fees are so high for legendary weapons some are not up there-but the highest bidders are getting close on a few of them! Putting them up there for so much gold is a waste if there are too many on the market. The sellers are losing too much re-listing when we compete against each other. So it forces us to ‘invisibly compete’ against each other.
Its important to make the buy orders closer to the equilibrium price when there are no items visible on the market yet you know they are actually there.