Simple. They aren't idiots. Im finally listening to the Mission Log podcast. A few months ago I listened to their review of the TNG episode with the Packleds. Their conclusion or opinion was that the Packleds are really masterminds and this stupid act is an act that lulls unsuspecting targets into a false sense of security. They've done this con for a long time with much success. If course, that's not exactly how LD presented them.