if i have $x I can maximize my chances by trying small bets many many times--after all, the payout multiplier is enormous and the stakes don't change. If I make 10,000,000,000,000 bets for x/10,000,000,000,000, I'm expected d to win 10,000,000 of them, and each win gets me x. So I've gotten 10,000,000x back.