Yeah that's why the 3080FE makes a far better choice than either as not only does it offer 90% of the performance cards like the 3090FE while being less then half the price but when it comes to resale value the money you lose is likely only going to be a couple of hundred quid compared to nearly a grand with the 3090.I doubt this last part will come true in time. Just look at how older flagship cards crash in price when the next gen high end cards come out at half the price and more performance. Just look at what happened to 2080tis when the 3080 was launched. They dropped to below £500 and would have stayed there if the market chaos that followed didn’t happen.
The typical used value of cards is based on their performance relative to what new products on the market.
As soon as the 4070/4080 drops the used value of a 3090 will tank to around £500-£600*.
*Assuming a normal GPU market, e.g. the new cards launch at similar price points and gain a relatively normal 20% uplift in performance and the current GPU apocalypse has passed.