In Tuesday's maintenance, they made it so WoD blue's have a chance to disenchant into 8-12 draenic dust. Draenic dust is worth much more than the Luminous Shards, so start d/e'ing your blues or even restore the blues you de'd using the item restoration feature and re-disenchant them for more gold.
I've sold/disenchanted like 75+ blues from 5man heroics and quest items since wod, so free gold