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all of my motorcycles have been older Honda motorcycles that have a centrifuge oil cleaner, a little spinning cup on the where the gunk spins to the outside of the little cup, I've rebuilt a number of these motorcycle engines, all the bearings are within spec still and there is nearly a table spoon of silver glittery gunk that I scrape out, the last two that I did were 350cc two cylinder engines.
I agree that a good 10-15 micron filter should be able to be used for longer, but when you change oil it seems like a good idea to get as much of the old oil out as possible as oil additives tend to burn off and wear out.
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