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My friend's dad recently started mining BTC with his gaming PC while he's not using it. As far as I can see, this kind of mining is not profitable anymore. He gets 40 Mh/s on average and apparently has made about $10 so far. I tried busting out my old Block Erupter USB miner which gets about 250 Mh/s and it hasn't made anywhere near $1. I'm wondering if he's just messing with me or if I'm missing something important. He could be mistaken about what coin he's mining but I'm pretty sure it's BTC.
Some quick math suggests that mining Bitcoin at 40 MH/s would produce 4 cents per year in revenue. – Nick ODell – 2017-12-12T20:36:15.173
See this answer. https://bitcoin.stackexchange.com/a/13674/1878
– goodguys_activate – 2017-12-12T20:45:00.917