Perhaps. Though it’s entirely conceivable that the cost of revealing said supernatural proof would be detrimental to their life in such a way that no use of a $1,000,000 would justify it. Or, ala Mr. Manhattan, they have lost their empathy and/or worldly concern. Or they could just be massive dicks who could make $1,000,000 easier if their secret is kept, like Hayden Christensen in Jumper.

So I stand by my point that only looking at James Randi’s $1,000,000 prize as proof that “there is no supernatural claims that can be proven” is an example of sampling bias. Even if you can not conceive of a person who would have no reason to, nor a reason not to, seek out the specific prize money.

Assuming the correctness of a hypothesis without sufficiently disproving potentially valid alternatives is how we wound up with the acceptance of the supernatural. It’s just bad epistemology.

Regardless, I believe that James Randi’s offer, combined with the lack of any other provable and sufficiently documented supernatural occurrences means it’s more than reasonable to not hold any belief in the supernatural. I certainly don’t myself.

ETA: 3. I suppose a third possibility is they were unable/unwilling to travel or were entirely unaware of said prize. Something like a “hermetic monk” for exame.