As a mechanic, I always shudder when I hear people brag about having X miles on their car and have never fixed anything. Most people are ignorant to the problems their cars have, often because they gradually occur over time. No, your car shouldn't make a rattling noise when you go over railroad tracks. No, the steering wheel shouldn't shake when you're braking. No, the car shouldn't make a whirring or whub-whub noise that increases with vehicle speed. At one point in the past, I thought that state inspections were pointless, but now I know better. I'd rather not have someone driving down the road next to me with a ball joint thats about to fail because the owner doesn't realize that that clunk means that something's wrong.
If your state doesn't do safety inspections, have your car checked annually...
Mark