Quote from HolyGrail:
He makes 25% of all profits. HE CAN'T LOSE. All he needs to do is convince enough people to give him the opportunity to trade for them.
He can also take the other side of the contract and have 25% LESS RISK.
EDIT: If he has 4 clients he can trade RISK FREE ON HIS SIDE OF THE LEDGER.
And worst of all, there is no way to verify this..
But that is likely what he was doing...