Is it a good idea to buy GPU from mining farm? Surely it was overclocked and in bad thermal condition, so it could barely survive. I think, electronic circuits degrade in those circumstances, so this GPU won't last long.
Once AMD and Nvidia print enough cards to match demand though that'll change again.
The only card I did hear of was a gamer who didn't mine, and as other comment mentioned, it was RMA'd.
I ran a R9 380 at 80 degress for months >_< sold it but it still worked a treat.
I'd love to upgrade from my GTX 750 ti (that I picked up for 60$ and an order of Chicken Tenders & French Fries) to something more high-performance.
Also, if you're not doing a 100% duty cycle, and replace the thermal compound on the card, even a well used card will last a few more years. If you can pick up the cards as sub-$70 it's still worth it.