Bitconnect is unlike any traditional HYIP/Ponzi scheme because they can literally mint more money to pay off the early investors and thus far have managed to extend the scope of the scam and form an exceptionally broad base of the pyramid. The key points are 95+% of the daily trading volume of BCC are conducted in their own internal exchange, therefore they are able to tightly control the price of the "Asset" and that if you backtest their alleged profit generation of trading volatility on the BTC/BCC pair, even if every execution was perfect (statistically impossible) they wouldn't be able to reach the targets necessary to pay out at the stated rates.