That's so true, I just got to replace in the previous December my GTX 970, which was the best of it's kind, the MSI 100 Million Edition that was running alone in a big cooled case and at just 7-8 hours a day under heavy load, not as the miners do, stacking cards like canned sardines running 24/24 at Max capacity; my has lasted just two years, a miners one obviously is lasting way less than that. Previously I had a MSI Radeon 7870 HAWK Edition that also lasted just two years at just 7-8 hours at heavy load. Yes, I got cards that I just retired without being damaged, but those were low end ones when I couldn't afford more than that, purchased over ten years ago when the cards were low power consumption and needing just one cooling fan for the GPU. So yes, an used card is a waste of money, it has very little life left if any and no warranty.