Agreed about the documentary. I don't think it's fair to describe this as a "con", though. Larson merely spotted a consistency in the game, and played it to maximum effect. All perfectly within the rules and regulations, no deception or "con" involved - and hence no reason for CBS not to pay out, which they did.

As the documentary points out, they just didn't think that anyone would be able to "aim and hit" the square they wanted - but they were mistaken, and paid for that complacency. They did not make the mistake a second time.