can you tall me why?
because if you having a btc machine you get your profit back in 4 month taking out the electricity bill
end then they charge you 1.5% for the mining deposit and the fee for the withdraw soo.. just with that they take a good profit.

if i will have the money to do a bussines like that , for sure i will do it

pdt.
i'm a investor on usi-tech really big company