WTWizard,
You give examples of things with a "cult" following... certainly there is nothing wrong with people who are/were fans of Minidisc (like me!), fans of a particular movie, etc. That's certainly not the type of "cult" we are talking about here.
Kevin Trudeau, though? Seriously? He is a scam artist. A convicted felon. He has been sued and fined numerous times for breaking the law. He is currently banned from even being in infomercials. How anyone can still put stock in his bullshit is beyond me.