This show is a great view into the minds of Penn & Teller. They are great skeptical thinkers and in this show they use Penn's brash way of talking to expose fakes and frauds in our world. Penn and his friends have long railed against psychics that claim to be able to communicate with the dead. Penn & Co. have always tried to expose these psychics for preying upon the grieving and lying to use human suffering to make money. It is no coincidence that the very first episode of the first series dealt with this issue.
The names Penn calls the accused "woo-woo-artists", liars, "whack-jobs", and con-artists may be a turn off initially for skeptics and believers. I find it a great display of rebellion against the belief that some of these con-artists (especially religious leaders) are beyond reproach. Because to Penn they're all just a-holes.