I live in Asia, but the shops here take their items from USA or Europe, and those places have been overrun by miners. Radeon, Nvidia; doesn't matter; any good graphics card over $300 can be used to mine 24/7, and people will get it because it's basically consistent money for absolutely doing nothing other than turning on the computer. I'd do it too if it weren't so expensive when it comes to the utility bills. I also like my computer so having it run 24/7 graphics-intensive programs would make it die a lot sooner.
Pretty much the same way that video editing software use graphic cards for encoding/decoding videos. Autocad use graphic cards for rendering etc.
You run a program on your PC that runs algorithms, which mines data, which you can sell to people (from what I understand). Problem is, it's a slow process unless you have a 1080 graphics card or something. Usual rates include $3 per day on a 1060 6GB, and that's if you run your PC 24/7, with your graphics card reaching temperatures of 80 degrees or more. I don't think it's worth it, but people out there think it's easy money.
Pretty sure those sites have jacked up their prices because of the sudden demand. I don't get farming bitcoin myself, but hey, it must be very productive in order to have such a high demand worldwide. It's pretty passive earnings from what I figure, so it's the best job to do for the lazy gamer out there who doesn't use his GPU much.
