If you think about it, the only way new BTC is coming into the system is through new investors coming in daily.

• The old investors aren't putting in new BTC, they're just reinvesting the interest.
• Bitconnect doesn't pay in BTC, they pay in BCC.
• It doesn't matter how much BCC coins bitconnect can produce, if they run out of new investors who are willing to exchange their BTC for BCC, everyone will eventually be stuck with BCC coins that are pretty much useless outside of the bitconnect website.

In short, the only way old investors can cash out is when new investors cash in (sounds familliar?)