No matter how you tune the numbers, Pirateat40 would quickly be able to trade with more and more of his own funds, kicking out investors and claiming the profits for himself. As soon as he has over 10k coins himself, it takes him 34 weeks to obtain one million BTC without the help of investors.
Forget it. Any theory without money laundering is a joke, and for that he lacks a supply path for fresh coins: too much re-investment.
In fact, just forget it period. There exists no explanation why anyone in the right mind would "share" returns like that over such a long time.
Boom! I'd like to see ponzi "investor" apologist try and defend against this one.. Why does pirate still share his profits? Charity?
Interesting, no takers so far.
We've already hashed this out as well. There's a currency risk. By him always taking his profit as USD, he reduces the risk to himself and passes it on to the depositors.