Here's the way I look at bitconnect. It's more of a risky play vs. a cryptos that have better use case. No one knows exactly how they apply their system to make a profit, but it's certainly quite possibly that they have trading bots that can leverage the volatility. There are big traders in the ES Mini's that sophisticated trading software. This is well known among day traders. So it's not out of the question that they have a legitimate system. If they are borrowing from their investors and making a profit from system trading then sharing a portion of their profit, then they could keep going for a very long time.

I do feel like its more of a high risk, high reward compared to other cryptos. Trading software often does very well in volatile markets, but not so well in sideways markets. So a change in market dynamics could eventually leave people holding the bag. The early adopters have and will make good money. As long as you are aware of that fact, then more power to you. There are people dumping money into complete garbage ICO's compared to Bitconnect.