I'm lucky enough to still have a GTX1080. Still a capable card, but it's showing its age. There's no way I'd recommend anyone pay anything close to $500 for it.
These words taste foul coming out of my mouth, but the way things are with PC GPUs right now, and if we're talking ballpark $500 for the average Joe rather than the extreme enthusiast, than perhaps console gaming is a better value proposition than old-gen PC gaming hardware? They're easier to come by, relatively speaking, sell at RRP, and are relevant. They'll hold some value and can be sold on when things settle down.
If things actually do get worse - I never thought I'd say this - I'd reluctantly take a sojourn on next gen PC gaming. Its still the king, but any sane value-orientated consumer would have to question where the extra value is at these kind of prices.
A 2016 GPU for $350USD in 2021?
Personally I'd rather go without, or use a low end GPU like a GT 710 or integrated graphics.
The situation is so bad that an RX580 is still relevant in 2021...
But I have a different question, since we are speaking about second handed products: how long will it lasts ?
I never kept a graphic card more than 3/4 years, and here we are speaking about products running very hot (often above 80° with hot spots above 90°C) for years, paying even $400/500 for them.
If it costs $150 and it dies after 1 year, it probably ins't a big deal. But what about $450 ?