I guess you're not familiar with Stock Generation. This looks like the same setup. You pay 20% per month for a few months using your deposits to fund the payouts and strongly encouraging reinvestment. Then, you close down all the funds with guaranteed high rates (or just don't offer them), offering people to either get into non-guaranteed funds at no loss or to take the 75% haircut to cash out. Either way, you make money. Then you just tell everyone in the non-guaranteed funds that you're very sorry but they lost everything. As was made clear, it's risky.

In effect, this can be a Ponzi scheme and can take everyone's money without ever breaching one promise they made. All they've promised is that you might make a lot of profit and that your losses are capped at 75%. It's basically like a casino -- all they're saying is that you might make money and you might lose money. The difference is, they've made no clear disclosure of under what conditions you make and which you lose. It's probably safe to assume you make money when that's profitable for them and you lose money when that's profitable for them.

You will continue to make money so long as their deposits continue to increase. Then they'll buy everyone out for just 25% and keep around 75% of current deposits.
http://en.wikipedia.org/wiki/Stock_Generation

The folks at Stock Generation lost in court due to a very slight miscalculation. If these guys learned from that, they can probably run this entire scam (keeping about 50% of total deposits) without breaking any laws.

The giveaway to this is that the investments are said to involve risk with no clear explanation of what the risks are and under what circumstances they lose money. This is what separates something like Stock Generation from a classic Ponzi. (If you read carefully, they can keep most of your money for no reason at all other than that they want to and not break any of their own terms.)