It seems like a weird coping or logic mechanism? I don't get it. I'm not replacing the motor every 10k in my car. And the recent engine rebuild on my "race" car

It seems like a weird coping or logic mechanism? I don't get it. I'm not replacing the motor every 10k in my car. And the recent engine rebuild on my "race" car didn't even come near that cost using definitely more expensive aftermarket parts.