If the letters sent didn't lie about how the prizes would be (amounts and everything), then there's no fraud actually.
EDIT: According to this, he was indeed a fraudster:
But anyways, even if there's no real crime, one may still question this guy's moral character. If he's not a fraudster, I'd still compare him with those religious leaders who collect tons of money "for God" to finance their yatchs and palaces. It's not a fraud - as you cannot prove that was not "God's will", but it's disgusting nevertheless.
I'm glad I didn't pre-order anything from BFL.