This armor is expensive because aluminum and DS are expensive and the HQ is awesome equipment for DD until thick gear, but the HQ is at least 2 mil, or the ones that have sold were around that on Gilgamesh server. Crafters don't want to lose a ton of gil if they dont HQ so they have price for NQ around price of materials.
why in the world is this set of armor so expensive? unless there are any hidden effects, i don't see why anybody would pay so much for just an average pair of leg armor.