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I can't imagine a pad losing it's cut. The pad is composed of the same material through and through. The reason for 3-4 pads is because they get dirty and can no longer be cleaned "on the fly".
I've had some pads for a long time, after they get cleaned up, they work good as new.
I agree with John, pads are generally uniform throughout and as long as they're cleaned routinely they'll perform just fine...