A state of the art SP-30 hashing at ~4.5Th currently produces ~0.076BTC/24hr, which is less than a lowly S1 (0.18th) produced less than 6 mo ago (mid March 2014). Considering that BTC in march was roughly similar in price, it is kind of astonishing. What's next year-a 100Th machine (10-20kw) that cost $20K, but produces 0.05 BTC/day with BTC price stagnating? That would be something...
100TH * 0.25W per GH/s will be consuming ~25KW ...0.25W/GH is VERY optimistic at this moment...
25KWh * $0.10 = $2.50 * 24 = $60 ...per day ...
This is what I called "POWER WALL" ...many months ago...Capisco...
You can NOT pay your electricity by making 0.10BTC per day ...@ $400... or less than $600...PERIOD...
That's it , folks!
ZiG