Profitable ?? You have to explain me because, according to my calculations it is not :
0.01124000*100GH = 1.124807 BTC
date (dd/mm/yy) days days added +diff diff gain in BTC gain added FIAT minus electricity FIAT added
8/4/14 10.2 10.2 0.00% 6,119,726,089 0.08256544 0.08256544 33 33
18/4/14 15 25.2 19.15% 7,291,653,635 0.09966282 0.18222827 39 72
3/5/14 15 40.2 20.00% 8,749,984,362 0.07973026 0.26195852 30 102
18/5/14 15 55.2 20.00% 10,499,981,234 0.06378421 0.32574273 23 125
2/6/14 15 70.2 20.00% 12,599,977,481 0.05102737 0.37677010 17 143
17/6/14 15 85.2 20.00% 15,119,972,978 0.04082189 0.41759199 13 155
2/7/14 15 100.2 20.00% 18,143,967,573 0.03265751 0.45024951 9 165
17/7/14 15 115.2 20.00% 21,772,761,088 0.02612601 0.47637552 6 171
1/8/14 15 130.2 20.00% 26,127,313,305 0.02090081 0.49727633 4 175
16/8/14 15 145.2 20.00% 31,352,775,966 0.01672065 0.51399697 2 177
31/8/14 15 160.2 20.00% 37,623,331,160 0.01337652 0.52737349 1 177
15/9/14 15 175.2 20.00% 45,147,997,392 0.01070121 0.53807470 -1 177
So you spend 1.124 and may get back 0.538 BTC after 5.84 months ?
Do CEX.IO charge fees ? What happen when the price of electricity > gain ??
Yes they charge a maintenance fee(electricity/hosting/repair), i think it was slightly over 12% of the mining incomes last time i looked at there site, it's probably slightly more now.
Recently they announced there about to charge fees(0,2-0,5%?) when people trade there GH to.