Hashing24 is another safe and big cloud mining site for bitcoin like genesis mining or hashflare.
Let's do some calculations.
Bitcoin contract for LIFETIME (currently out of stock):
Price:3.195$ / 10 GHS - 0.00033$ / 1GHS fee
Profit:0.00000201BTC / day (with fee)
0.00845$ / day (with fee)
ROI (Return of investment):379 days
Lifetime means as long as it is profitable!
All calculations do not include changes to the BTC difficulty or price!