The two main points of the show are to feature and raise the profile of younger magicians, and to get modern video records of their tricks. The "fool us" thing, while genuine is pretty ancillary the point of the show.
>It also gave me a glimpse on how secretive the magician community is. Since people earn a living selling required gimmicks or instructions on how to perform specific tricks, it is completely unacceptable to discuss how things are done. For the really puzzling ones on the show, if you go online to try to find the answers, you'll often find others asking the same thing, and the accompanying wall of silence. Even more so on forums dedicated specifically to magicians. You're likely to find a large discussion, usually with links to the official store for the trick, and zero answers. To do that would be breaking the magician's code, and apparently, you don't break the code.
Very, very, very, few people make a living selling tricks, and most of those are people who design and manufacture large stage illusions for the best magicians. A small handful of performing magicians ALSO sell tricks at retail magic shops. A few more than that write and publish books through magic publishing.
Some folks take the code of silence VERY seriously, but notably Penn and Teller do not. They do a cups and balls with transparent cups. They do Lift Off Of Love, which shows in detail how to do a pretty involved stage illusion. They LOVE telling people how things are done. They share similarity with Houdini in wanting to expose people who pretend that they actually have supernatural powers, and some of their tricks are aimed at showing that it's really just a high skill profession.