At the current BTC price of 419.50 USD a miner/hardware that cost 750.00 USD with a
hashrate of 4.70 thps that uses 1400 watts at 0.03 USD/kWh will
ROI in an estimated 1 year, 15 weeks, 1 day, 10 hours, 50 minutes, and 0 seconds
I guessed on shipping but that's an s7, and psu. Now at even an average of a 2.5% difficulty increase:
At the current BTC price of 419.45 USD and an average difficulty increase of 2.50%
a miner/hardware that cost 750.00 USD with a hashrate of 4.70 thps that uses 1400 watts at 0.03 USD/kWh
will not make ROI as your miner will become unprofitable after earning 512.47 in 48 weeks, 0 days, 0 hours, 10 minutes, and 0 seconds/code]
and that info is under "0.03 USD/kWh" imagine how many it will cost on some countries with 0.17kwh ( like my own )... mining bitcoin is like a dream in some countries... even with 2,5c per kWh as the OP says is not profitable.
BUT... if you have 10x of those it will be good profit atleast for me
It doesn't matter if you have 1, 10, 100, 1000 of them the result is the same you won't make anything until the initial investment in the miners is made back (ROI) and that won't be for over a year if ever. The only way you could make money is if the price of bitcoin goes up in which case it makes more sense to just buy and hold.