I see many people running marathons again and again, without trying to improve their times, and without caring for their time. Like their goal is just to finish it again and again, year after year. Usually it's hobby joggers in running groups with times around 4 hours. Why? What's the point? If you don't care for the time, why do you care about the distance being an official 42.2?
If you just run for fun, why bother to do a whole official 42.2 km? Just go and run in a group, or alone in the park without measuring anything....