There is usually a correlation between the price of the ball and the relative "strength" of the ball. The top tier of balls are mostly asymmetrically-cored balls with early-rolling low rgs, and very aggressive cover materials. That being said, there are a lot more cases of bowlers who use balls that are much too strong for their bowling styles, than there are of bowlers who don't average as high as they could because their balls aren't strong enough for them.
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