A recent September 2017 blog[1] estimated electricity mining costs to be ~$19k. (I don't know if bitcoin community has adjusted the hashing difficulty since Se

A recent September 2017 blog[1] estimated electricity mining costs to be ~$19k. (I don't know if bitcoin community has adjusted the hashing difficulty since September 2017 to maintain the 10-minute block rate.) Are there realistic scenarios where the sustained value of bitcoin exceeds the mining costs? What was the mining cost of 1 BTC in May 2010 when the famous request for 2 pizzas[2] for 10000 bitcoins was made? [1] https://grisha.org/blog/2017/09/28/electricity-cost-of-1-bitcoin/ https://grisha.org/blog/2017/09/28/electricity-cost-of-1-bit... [2] https://bitcointalk.org/index.php?topic=137.0 https://bitcointalk.org/index.php?topic=137.0