From what I understand, if you use your ability to excess "greed" then you will falter and lose your gifts. Her ego and thirst for power has blinded her to spirit. As for Mr. Randi. How can you prove something that cannot even be measured? Science is still trying to understand psychics and how the brain receives, it is a mystery. Even if the proof was right in his face, this guy would find a way to dismiss it. He has his OWN ego issues :P