The prices don't seem too high to me, so much as they seem... odd. A stack of Ore is less way expensive that a a stack of herb, but they're equivalently difficult to farm. The same stack of ore is also less expensive than a stack of cloth, which most people farm tons of just doing dailies and dungeons. It's by far the most common mat, because there is no required skill to gather it. Savage leather is also way more than either ore or herbs, but requires a similar amount of farm time. Enchanting mats seem about right for the Celestial essence, but the heavenly shards seem cheap relative to the difficulty acquiring them, and the dust seems way over priced considering how much more common it is and how much more of it is typically needed.
I'd equalize the leather and ore, make the herbs a little more expensive (but not a full 50% more) to account for the random gambling factor that you might get a particularity good herb stack, make Heavenly Shards cost as much as ore and leather, keep Celestial Essence where it is, and make dust like 50 points. That would be pretty relative to their value in gold on the AH.