You may want to consider that it may be possible to be more profitable just buying the coins. Even if you buy a contract and the coin value triples to make the contract you bought profitable you would have been better buying the coin. I found this great article where the guy seemed to do a ton of research. Seems like the most profit comes from the affiliate program which is sketchy in my opinion. https://99bitcoins.com/genesis-cloud-mining-review-scam-legit-investment/