Re: What is the point of beating Balor?
None, unless he shows up as The Demon at Summerslam. Like, have Balor bring out The Demon on Raw and Smackdown next week and win a couple of big matches to show that Bray will have his hands full come Summerslam, then put Bray over clean regardless and make him look like a strong threat right out the gate. The fact that Balor is taking time off after Summerslam will also make it look as if Bray has killed The Demon (and thus, Balor) once and for all.
Of course, because this makes all the sense in the world, they won't do it, but it's nice to think about.