Many cars are fine for much higher than average mileages, if they have been looked after. Unfortunately most people buy a used car at (say) 100-150,000km, and feel they have a bargain. Which they probably have. Unfortunately they have lost sight of the fact that it was a $100,000 car when new, and comes with the running costs to be expected of a $100,000 car.
And then the rot sets in - servicing is skimped, the cheapest possible parts are bought, and the absolute minimum done to keep the car on the road.
Not my car though. At least, not since I've had it. Sure, I'll save money if possible, but not at the expense of quality or if it means a half-done job.