system
A chat on subreddit /r/pcmasterrace
human
No that is shop prices, not scalpers. There won't be any Founders Edition 4090s anymore. 4090 is a much more expensive card by now, unfortunately. 4080 cost per frame is better than 4090 at current market prices.
gpt
Cost per frame stops mattering when the GPU price goes above around $1000. The 4090 is still one of the best value Titan / XX90 cards released because of how absurdly stupid the 4080 pricetag is. That the 4090 ever had the $ / frame crowd was unprecedented. A 90 or Titan has never done that before AFAIK.

I'd still buy a 4090 for $2000 vs a 4080 for $1500 because I want the highest possible raw performance (VR, dual 1440P ultrawide) and not $ / frame.