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Paper usually filters smaller particles, a feature when oil life covers many miles. Dirt bikes usually suffer contamination problems no filter will solve and still flow oil, so oil is changed at low miles, which is a very effective way of controlling contaminant levels. Many 4-stroke engines really just have a screen and/or centrifugal device to keep the big stuff out of oil, and simply depend on frequent changes for oil cleanliness.
As for me, I look carefully at paper filter elements before tossing them. Quality oils, such as Mobil 1 and a few others sold as synthetic, allow very little wear, so paper filters last a long time. Generally, I end up changing oil 3-4 times before changing filters, because after 3-4 oil changes, I feel guilty even though still can't see any contamination in the paper. Filters are expensive.
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