no doubt it's cheap insurance, but you're trying to combat cylinder wobble. A conservative tune (from a competent tuner) will minimize much of the wobble. My buddy just made over 700hp on the stock sleeves in his integra. Granted it will only last 40-50 passes at that power level. For the everyday 3-400 hp I don't think it's needed.

And I do agree, the pistons' ringlands are the weak point.