user40998: 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.

user44137: Mining Bitcoin at 40 MH/s is not profitable. 
Unless you get free electricity and consider 4 cents a year profit, there is no point mining Bitcoin with that hash rate.
Does your friend's dad have $10 in Bitcoin from mining with that hash rate? Simply put, no. Your friend's dad could have, however, been mining a different cryptocurrency without knowing. 40 MH/s mining Ethereum produces $3 a day.

40998: <p>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 <em>$1</em>. 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.</p>
 44137: <p>Mining Bitcoin at 40 MH/s is not profitable. </p>

<p>Unless you get free electricity and consider 4 cents a year profit, there is no point mining Bitcoin with that hash rate.</p>

<p>Does your friend's dad have $10 in Bitcoin from mining with that hash rate? Simply put, no. Your friend's dad could have, however, been mining a different cryptocurrency without knowing. 40 MH/s mining Ethereum produces $3 a day.</p>
