this is the only cloudmining site i can say, for sure, is not a scam.
the only thing i've invested in before was the s5's and i made a nice profit. even if you barely reach roi, you can have the miners shipped to you after the cloudmining shuts down ... and then resell them.
I am quite confused when i visit the site does it really requires you to put 1btc to for your contracct? and to be able to start mining using the power that you have purchase? or is there any way to mine without sending 1btc
You are probably looking at their PACMIC-contract, which indeed costs 1 BTC each.
It is possible to start cloudmining for a rough 5k satoshi (0.00005 BTC), which are the current market prices for S7-hashpower per each Gh.
(sign-up, login, and then check under "Hash" on the left side to see these possibilities)
But the difficulty is rising too fast. It might not be profitable soon.