I read it. excellent article. conclusions. why bother mining when you could speculate just as easy.. there is one caveat though. If you mine new coins, then you could mine them really cheaply and then they rocket. when bitcoin was a baby and the network was small, you could have mined 100btc per day on a p.c. At today's prices that would be about $4.5m per week. I don't think that will happen again, but you could be mining coins today that will be worth 10 or 20x their current value in a year or 3.. btw (Again) nice rig !