It's a triumph of regulation that he got his money. It would have been very natural for CBS to cite technical difficulties or find some other way to change the rules of the game, but US game shows in this era were terrified of the FCC, who were given strong powers to enforce fairness in game shows after some frauds in the 50s [0].
Those laws are still on the books, of course, but I expect game show producers have got better at working around them in the small print, while regulators haven't kept up.