If you have even a dollar to your name, hindsight investing could make you unfathomably rich. In short, it allows the purchase of an investment at an older price, even after the market has moved. If a fund increases in value, just buy it at the old lower price to realize an instant gain. This is clearly unsustainable, and yet in the recent past, multiple companies offered this sort of thing to rich clients. Soon, it might destroy them.