There will be a 20% increase of difficulty every time (highly unlikely)
You are running 500 antminer s1's at 200 gh/s, 400w apiece.
BtC/ USD = 624
$/kwh is .21
Antminer is .89 each, no other costs.
With all that, breakeven for 100 th/s is 81 days, with a 20% increase difficulty every two weeks, and power costs are factored in as well.
try your self: http://bitcoinwisdom.com/bitcoin/calculator
Thanks for that, Also did some figures on the thegenesisblock. Says up till June will only be profit after that will be in the negative
No matter how much I could invest the costs don't weigh up the profits + if say I buy 500 S1's within a month or two these will be come old hardware :/
Trying to get the business model right