It ensures that player will not get the benefit of an avoided scratch by having a pocket full of balls.
Maybe a better alternative is not allowing that many balls to be pilled up in a pocket. That could also present a problem for pocketing OBs (e.g., for an unsuspecting opponent). Allowing or purposely placing many balls in a pocket to help reduce the chance for scratching (or to reduce the chance for an opponent to pocket an OB) should be an unsportsmanlike conduct foul.
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