There is a similar game that distributes more of the money to causes where people vote with their dollars and antidollars and the winning side gets 1-epsilon of it because the operator of the game requires vigorish.
It's like poker with no cards. Ideally the winner puts in just a dollar more than the loser and they nearly double their donation. If the winner can't get enough information to do that and has to spend too much for the pot they end up making a huge unmatched contribution.
The game makes sense to play if you're sure you will win but you don't want to start it if you think you won't.