Yea, it's nuts. I bought a 4080 3 years ago, and there's no viable upgrade path. I should have went with the 4090 in hindsight when it was $1600 USD from Nvidia's website; figured I would be upgrading around now.
I configured my PC in December 2023 with a kit of 2x32GB DDR5-6000 for €249, thinking I would upgrade that RAM later to 128GB by just adding another kit. Now nearly 3 years later that same kit is over €1500 :-(
I've also lost all interest in upgrading to a 50-series GPU. With exception of the ludicrously expensive 5090 the entire 50-series lineup is capped at 16GB, I don't see the benefit of upgrading.