Miners buy a lot of cards, but we also push our cards 24/7. Meaning any weak cards in our Rigs typically die within a few months. Where if they were just used for gaming. Some gamer who plays maybe 20 hours a week, will never push the cards to that level, and when they finally die, they will be past their warranty. I seriously see them dropping the Warranty to 1 year. IF I remember correctly, their dedicated Mining Cards only have a 3 month warranty.
This is untrue.
Many people have been mining for years with the same GPUs at 24/7 and they are still running. The GPUs usually are rock-solid, its the fans that start to die first because the bearings go out.
Gamers might not play for 24/7 but you need to keep in mind that they usually keep their GPU in a small enclosed computer case with poor cooling and they usually overvolt and overclock their GPUs. Miners do the complete opposite, they got open rig rigs, and they usually undervolt and underclock their rigs. They are put thru less abuse than hardcore gamers.