Let's read between the lines here. So USBC will allow 3 oz of static weights, yet not allow any holes in the future.
So, in their research, even 3 oz won't alter the ball motion enough to worry about. Therefore, no pro shop has any business trying to get extra close to 3 oz, instead of 2 oz, or even 1 oz.
Of course, all of this depends on whether or not you think their research is sound...