It's artificial control of supply from the manufacturer. If Nvidia or AMD want, they can flood the market with so much supply, that the prices of graphic cards will drop back to their pre mining boom. It's all part of their game plan, and I am sure that they won't be changing anything to that. It works extremely well, so why would they even change things? These businesses are worth more than ever before, and they want to keep it like that. I see a lot gamers complain, but in the end they still pay the premiums because they don't have any other option. The prices won't decrease in the coming years, so either adapt to the situation or stick with lower tier graphic cards.