It might not make sense on the macro scale, but it certainly does on the micro scale. Even if you only use the extra size of the car a fraction of the time, the

It might not make sense on the macro scale, but it certainly does on the micro scale. Even if you only use the extra size of the car a fraction of the time, the amount of money and time you would spend to rent a larger vehicle the times you actually need one would be much higher than the premium you're paying for having a vehicle with a capacity that well exceeds your average use case. Also, one out six Americans are over 65 years of age, two out of five are obese, so the "extreme vast majority" being neither old nor disabled is really a question of definition.