Bitconnect is likely a scam or sorts form what I can see, and several others have voised similar thoughts . One telling event is that on November 3rd 2017 total market cap had a sudden drop from 2Billion to 500 million (75% less) market cap without price changing. (according to coinmarketcap.com)
But hey, if its being kep alive by its users there may not be any loss, just the creator becomig very rich? I guess time will tell if they do pay out as promised or not.