If I had to guess, I'd say its either from bad shock dampers, or more likely from the additional clearance between the plate tabs and fingers of the resurfaced baskets. Its easy to not think of the abuse this mechanical interface takes, that is until you own a dry clutch Ducati. Both wet and dry clutches function the same and are in a constant state of self destruction, but on the Ducati you are constantly reminded of the increasing wear and gap by the increasing rattle as it is not damped by the closed cover and oil bath. The larger the clearance, the more time the plates have to gain energy before they slam into the basket fingers. In ten years on three different GGs I never broke a clutch plate, but I never filed a basket either.
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