Talking from actual experience, what was your question?
Scenario from real life experience, same car, same tires brand and style or made up ?
Fronts last 10k longer w/o rotating than fronts that went to the back on a regular basis, say every 10k and spent half their life on the rear axle ?
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Sorry but your example will not follow for most situations. Assuming that there are no problems with tyres, or car, rotation will make no difference in miles per tyre. If there are problems then rotation may provide better overall mileage per tyre and increased safety.
Most people rotate tires because it makes them last longer and because, as responsible car owners, they rotate the tires before wear becomes uneven. If your front tires have enough wear that it would be unsafe to rotate them to the rear, you have waited too long between rotations.