You watch most of the pros and they can hold their finish on most of the strike balls all day long; however, when they roll their spare balls, particularly their single pin spares, they're all out of balance and popping up at the line. Why is that? Are they just throwing that hard at them that they can't stay balanced? Seems a little risky to me...I wouldn't think they'd have to throw any harder, particularly if they're using plastic as most seem to be doing.
