Forgive me if I've misunderstood the meaning of this tag, but under the prices settings where you can choose what price source uncommon/rare/epic etc items should use, there is an option to "ignore enchanting materials." I took this as meaning that it would set the value of enchanting materials to 0 while ticked, however I've found that when disenchanting with a session running, my lesser planar essences are getting included in the total value along with the DE value of the item I disenchanted. For my arcane dust and my small prismatic shards this is not the case, those are valued at 0. I've worked around this by setting the value of my lesser planar essence as 0 manually, but it would be ideal if the option worked properly.