[123anonanonanon]

It is the assumption that the two cars always make the same number od miles indepedently od the cost that is unusual and unintuitive.

[skrtskrt]

If you think of it as a family that keeps obstinately driving both cars the same amount despite massive cost differences its weird but you could think of it as a mixed fleet of delivery or work trucks that are all needed regardless, the question is how you manage or prioritize upgrading them.