There's a big difference between a supersport bike engine that gets 120 hp out of 600cc and a car or truck engine that gets 120 hp out of 2.5 liters. The motorcycle engine revs to 12 or 13K where the car engine only revs to 7K or so. That said, I know of at least one 600 that was on the track with 80K miles on it. I had a 600 that I put 50K miles on, in spite of defeating the rev limiter in a misguided attempt to wring a few more hp out of it. They last just fine. I think people tend to park them or wreck them.