The big thing about the Press Your Luck incident that people seem to overlook is that finding the flaw was half of the con, exploiting the flaw was the much harder part. (that is, getting selected to being onto the show, answering the toss-up questions, and getting the patterns/timing correct). It was more-or-less luck that everything worked correctly, and as noted in the documentary, the con almost failed at each point.

The Monopoly incident in comparison is just boring manipulation of insider information.