this is with their maintenance fee at 0.01 USD per 5 Gh/s for SHA 256 hashpower, Estimated Next Difficulty +4.28%(bitcoinwisdom.com)
the Rate BTC to USD has to go up to about 600 before i hit ROI in about a year... if i had just bought btc for my 83usd and then the btc to usd went up to 600 i would have earnd 50usd at the same time

can some one please tell me i have done something wrong in my calculations?