mileage isn't a big deal if the oil is changed, rshared_pm doesn't kill sport bikes, the lack of maintenance does.
keep the motor small and you will have more fun and get in less trouble.
Cars last, what, 200k without needing a rebore.
They spin up to ~6-7k RPMs.
Bikes spin to 16k+.
That means that the bikes are scraping the compression rings agains the cylinder walls over twice as much as cars. There is no more basic wear and tear on a motor than the metal(alloy?) ring scraping the cylinder wall. Revving kills motors. So do other factors, but when you get right down to it, more revving means more movement which means a shorter lifespan.
Sure, things like stroke make a lot of difference, but you're still causing parts to move even if you've got a lil tiny stroke like sportbikes do.
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