I know PLEANTY about balance holes, and how to use them (take a second to read my review on the Anarchy, where I discuss the use of balance holes and relation to spin times).
The point is, WHY spend the money on the strongest cover stock produced to date, and turn it into a dry lane ball by reducing the flare and hook potential? There are numerous bowling balls out there that this can be accomplished with, and see better results, because that is what the ball is intended for.
It is fairly safe to say, that more often than not, the use of a balance hole is to increase dynamics in weaker balls, to make them stronger, and perform beyond the design of the ball. When drilling a ball that fits into USBC specifications without the use of a balance hole, this allows for the pro shop then to tweak the desired reaction after the bowler has thrown the ball, and fine tune it to his needs (often cover preparation is the first step). If you start with a big balance hole just to get the ball legal, you are now limited to what you can do with alterations of motion.
My point is, his pro shop operator may know a little more about the conditions he is bowling on, and the bowlers tendencies, more so than you or I, as I know I have never seen this guy bowl (have you?), or know what surface he is bowling on, or the volume of oil, or thickness of oil, shape of oil pattern, etc... It is very unfair for people to jump on a pro shop before knowing all the facts.
Tommy Gollick
Storm Regional/Pro Shop staff
Red Crown Pro Shop Harrisburg, PA
stormbowling.com