The quantum suicide investment strategy: hold your gun to your head and make a CRAZY bet on the currency market, leverage 200 to 1 buying or selling something. If you lose your money, pull the trigger. If not, when you have doubled your money, repeat the process. Because of the anthropic principle, your consciousness will only continue to observe its continued existence and apparent good luck in those universes where you won the bet. Thus you will always win, from your own point of view. No, I'm just kidding. You still lose. And then you die.
Seriously, this sounds like something someone who plans to destroy the world says as he's pressing the button.