The lack of supply is mostly lack of players crafting per server. If you want to fix it, then start crafting! And encourage everyone you know to start crafting!Supply of crafted items can only go up if players are making them. If you don't want to craft, I wish you luck on your daily GobbieBox pulls.
HQ prices are set by crafters/players, not the dev team. If you want to blame someone, blame the farmers who set the price on materials, since those prices are what crafters base their HQ prices on. If everyone would at least be willing to buy NQs at cost, then HQ prices would be able to drop, but when a good chunk of the top end NQs sell at a significant loss, (which frequently doesn't even sell fast enough to be worth the AH slot,) that loss has to be made up elsewhere (namely HQs.)
Newer HQs also have a larger difference compared to NQs than they have in the past, and those differences are frequently enough to cause noticeable impact. For example, EA HQ set has an extra MBD+5%/MBDII+5%, which can free up an extra slot used by MBD1 and adds an extra MBDII+5% that can not be obtained elsewhere, and that is in addition to the other stat increases.