Funnily enough, there's been three times I've sold a GPU for more than I bought it for:
1) RX 5700XT: Bought on release for £400 in autumn 2019 (reference blower style
). Sold during crypto mania in 2021 for £750. Nearly sold it for £300 in summer 2020, but changed my mind (thank god...)
2) 4070Ti: Bought from the jungle Nov 2023, mispriced at £575. Sold it six weeks later for £675 (which was the average used price at the time). This was a tough one, I actually wanted a 4090 but couldn't resist the misprice. Using the 4070 Ti just made me want the 4090 even more. Also, the Super cards were releasing in a few weeks and I was worried the 4070 Ti would crash (shouldn't have worried, considering how crap the super cards turned out to be).
3) 4090 FE: Bought a year ago for £1579 MSRP. Just sold for £1,900, getting ready for the 5090. After £135 (!) shipping cost, I did make a profit, so not bad.
The point I'm making, is that it's perfectly possible to inadvertently make a profit on a GPU without being a scalping scumbag
Would I sell the 5090 Suprim for £6K or £4.4K or whatever? Probably not, tbh. I get quite excited about tech and I'd want to use it asap...