Track flare is just the result of the core making the ball wobble a bit as it goes down the lane.  Each flare ring exposes a fresh surface to the lane, theoretically increasing reaction.  If it didn't flare, the ball would be rolling over a part of the cover already covered with oil which might make it skate a bit.  A lot of flare isn't necessarily good or bad.  The ball, it's surface, the lane conditions, and your rev rate determine how much flare you'll get.  Like anything else, you want the proper amount happening in the proper place.
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Ron Clifton's Bowling Tip Archive