You don't have to be "retarded" to fall for something like this. The poster clearly is quite intelligent. He also thinks he knows how to beat the system. Behold the system in all its perfidious majesty: if there are two people in the world smart enough to beat it, it will take everyone for all they are worth.

The smartest man I have ever known, who will one day cure cancer, once described to me in all earnestness how the double-your-bet-after-you-lose strategy was flawless. (Relatedly: He also was a fan of penny stocks.)