On a Reddit AMA video Penn and Teller said they had to defend a lot of positions they may not have agreed with on the show such as smoking and recycling. They always wanted to end the show with the bullshit of bullshit and bust themselves but it never got renewed. Even penn knows he's full of shit sometimes. He even made a public apology to Maddox for being dishonest about his episode.  I still think he should be setting a lower weight goal. I should mention the only reason I'm lurking  this thread so much is I've been watching Penn and Teller since I was little (and basically all magicians I'm enthralled by). He's Def been changing his tune the last few years. It's so odd how he's integrated into the science spheres the last few years