The efficient markets hypothesis is that one should expect ‘no remaining region’ to be the default. While betting may not be as competed as finance, there are still hedge funds etc doing betting.
Also I would suggest thinking about expected utility greater than some positive threshold to take into account transaction costs. I suppose that this would make a good deal of difference to how many such regions you could expect there to be.
The efficient markets hypothesis is that one should expect ‘no remaining region’ to be the default. While betting may not be as competed as finance, there are still hedge funds etc doing betting.
Also I would suggest thinking about expected utility greater than some positive threshold to take into account transaction costs. I suppose that this would make a good deal of difference to how many such regions you could expect there to be.