Things will settle. Nib were selling at a loss before covid. This will come back. Prices will come down a little, not much though. The pinball market has always been strong.
Stern is seeing the money on the table and probably should have a long time ago. Pinheads are crazy with their money, so the market will weather the increase no problem.
If you don't like it, stick with older machines. There are so many great titles out there. I can't wrap my head around anyone complaining about not affording nib.