Of course and that is how they get customers... If you never heard about HYIP, check it out on google... I think that this is the same thing, all of them finally crush... I have invested a bit before, and I think that it may be good idea to invest to some of them at the beginning, then you can make something, but I lost some money on some HYIP few years ago, and since that time, I never invested to something like that again...
Actually Ive invested into genesis mining, but now Im affraid about it also... As for example I think about a one question... I have money there to mine ETH, but as ETH is going up, Im receiving les and less, I think that Im receiving daily amount of USD converted to ETH, and that is scaring me, as price of ETH just can not influence mining machines lol... I should get each day same amount of ETH I think with the same mining power... But its not like that