I usually try to do similar bets with people who throw money on lottery. (I give you $1k if you win, you give me $500 if you lose). But no one ever accepted it, which is confusing. Shouldn't people be confident that they'll win the lottery if they're betting on it in the first place?
The world was, in fact, supposed to end tomorrow. But I intervened to save it. When you wake up on December 22nd and realize that you are still here AND would like to express your appreciation for the world being spared, please mail your donations to me at... " ;-)