Hi Jason,
You may not need to know it. It's a piece of information that is vital to drillers wishing to accurately lay out equipment (which is essential for some drill patterns) and players who really want to learn the mechanics of bowling ball reaction. Do a Google search on "rotational physics" for more.
And no, it won't help you select a bowling ball. (Sorry.) A good pro shop will however, so I recommend finding one that services your neck of the woods. Get several opinions on this.
Cheers,
Jason