Now that Crypto is Dead

That's like saying a used car is fine as long as it hasn't been involved in an accident or been damaged otherwise. Even under perfect conditions, anything will wear, more so under continued usage for long periods of time. You're just a miner trying to make people believe your raped-in-the-ass cards are fine.

>electronics are made of moving parts
No, I want to play Fortnite at more than 30 fps.

If the card was used for mining, the VRAM was overvolted and is not able to work properly
Dead VRAM means a bricked card, so don't buy anything that seems too good.

Not every miner tweaks their cards, but everyone is desperately selling them. The price keeps dropping from 300 to 260 and now as low as 220, so I thought it might be a good time to get one.

Even if the card isn't overclocked to any extent, there isn't a reason to stop mining unless your card stops working or you aren't even turning a profit compared to the power you use
The former is pretty likely in a lot of cases

it seems stable at 6300-6700 now, i doubt people are buying up an entire store's stock of gpus to mine at this point

After the crash, mining is not worth the cards, plus new cards coming out soon. Common practice to sell your current card for (normally) almost full price because of demand then just get the new one. But since the price is fucked, its not worth keeping them and they want to sell ASAP before their last gen cards wont sell at all.

>only moving parts degrade
Here is your certificate of mental disability.

>check rx580's on craigslist
>$280 - $325

>check rx580's from retailers
>$380 - $425

What the fuck is the problem with retailers

Friction/stress is the most common failure mode of non-electronics. What would cause a non-defective electronic to fail from normal use? Basically all of my electronics work as they did from 10 years ago. Just make sure they don't over heat or drop them and they will last for a very very long time.