Out of 16 servers, only 4 of them have sales below 3M in the entire visible history. Some have no sales below 4M. One has no sales below 5M. Paying 6M per set of mats instead of 4 just means you're trying to compete in a global marketplace while refusing to trade outside your own city.
tldr; price will drop, strongly suspect most of the wts/sold threads are faked because you'd have to be incredibly stupid to pay that much over when the items are sitting up on AH.. supported by things like posting:
prior to dropping it to <350