I am one of those miners who are buying GPUs right now at inflated price like you said but I want to tell you that Im not going to get screwed because I was in this game in 2017 and I knew how it felt to keep mining when profit is down and hold your coins for few years, red market is the perfect time to mine coins in my own world.
If you wait until GPU prices crash, you can buy 2x or 3x more cards, and thus collect 2x or 3x as many coins during the bear market. If you buy now, you'll have less equipment, which will generate less coins, which will eventually provide less profit in the future.
I learned my lesson in 2018: do not buy equipment for too high a price, especially not when there's news that PoS is happening in 3 months.