Thank for your reply @lethn.
I'm totaly agree for you said. It's true, genesis mining if the coin is not profitable they stop your hash but i think is it a pro. On genesis mining you can choose the coin that you want to mine, so if the open contract is not profitable, genesis stop it and you can choose another coin.
I just thought I'd post a fair warning, a lot of people come into cryptocurrencies with no experience at all and even the fairly experienced among us can get caught out by this sort of thing unfortunately.
Sure, in this world the scam is always around the corner ( I don't know if it says so in English :) , i'm Italian )