Are all psychics, tarot/palm readers, etc... intentionally defrauding the public, or do some of them truly believe their "abilities"?

There is little doubt many of these practitioners are full of it and they know it. But do you think some believe they actually have these “gifts” and think they run a legitimate business? Alternately, do you think some who believe they are psychics might see bad news in someone’s future but lie and tell them good news so they keep coming back?