I'd bet that much that they never give away a single cent.

You'd win that bet. This offer has been made for quite a few years.

Yeah. The problem with this guy is that he decides for himself whether the "experiment" is valid or not. Not to mention that he's trying to apply a positivist scientific paradigm to a problem better suited to interpretivist thinking.

I thought they ended this.

Randi has exposed quite a few phonies over the years including Uri Geller, and some "evangelists" that claimed they were curing people with their touch and other cons.

To me there's nothing interpretivist anout this at all. You can either do what you claim or you can't.

Of course the caveat is that you have to prove your paranormal powers. To say he decides for himself is misleading. He and scientific staff set up the parameters for the activity to eliminate any possibility of fraud or coincidence.

If you read his book "The Amazing Randi" I think you'll be convinced he's on the level.

The "Amazing" potion is left over from when he used to perform magic on childrens shows years ago.

Saying that he decides what test is valid or not is very deceptive. He and his team design the tests and the participant agrees or disagrees with it. If the participant disagrees than they redesign the tests. So, there is a mutual agreement. He does not have someone succeed then say, "Nope, I don't buy it, no money for you!" For example, he has tested diviners who claim to be able to find a mineral or metal or something with one of those stick things. So, an example test for this if the metal were gold would be to get 5 identical boxes and put a chunk of gold in one of them and have the diviner try to find it. Obviously, chance would have someone find it on the second or third try. For someone to win the money as a diviner he or she would probably have to repeatedly pick it on the first and possible a few second tries to prove that he or she could actually detect gold and was not just doing it be chance.
Randi is pretty legit and has a genuine interest in this stuff, at least in my opinion. I think that if there were actually supernatural things he would be one of the first to know about it because of all his research and investigations.

I take issue with how he paints all non-positivistic beliefs with the same brush. Although you are probably right about his methods (I have no reason to believe otherwise), I tend to mistrust people who have such a chip on their shoulders. E.g., what is his issue with "faith healing"? Western medical therapies are dismal for many chronic conditions, and vastly more costly, but apparently he accepts them outright. He is every bit as much a "believer" as the people duped by Uri Geller.

Interpretivist philosophy is actually quite relevant here. The belief that reality is individually constructed, not externally determined, suggests that if someone believes they are influenced by the healing powers of another, they may well feel better, live longer, and function better. This is the basis of the placebo effect.