The return on investment (ROI) date given on your site may be a little optimistic. You have assumed there will always be 25 bitcoin per block, ignoring the halving mid next year to 12.5 Bitcoin per block.
Your ROI breakeven, at $240 per Bitcoin, may be closer to 900 days rather than 615 days.
This halving is ignored by a number of the ROI calculators. At least with the coinwarz calculator you can experiment with the number of Bitcoins per block.
Yes you're right , it's optimistic, not full worked out plan , still need to calculate electricity , inverter, psu, cooling system and anything I forgot.
As stated on site "can vary greatly".
http://bitcoinclock.com/For what I understand from it, it also means BTC price should go up considerable, being an optimist ofc
