This $1 million challenge thing means nothing. It was obviously designed by someone who doesn't actually want to have to pay out the million bucks.
I was reading on the forum that you posted a link to how John Edward has a certain percentage of his statements that are verified as correct when he's doing a reading. I don't think you can break it down into percentages. I saw him do a reading where he said "when you were in Niagra Falls, did you see a feather on the ground, and you picked it up and you said this is from Dad?" and the woman and her daughter burst out into crying and saying yes that happened two weeks ago. So, what, that counts as one hit? And it is cancelled out if he says "who is Marry Ellen?" and they don't know? I don't think it's that simple. You say something freaky true like that and it proves something to me.