I guess the form of the car is very much a trade off of competing interests - cost to build, ease of maintenance, available space, etc. Since you asked specifi

I guess the form of the car is very much a trade off of competing interests - cost to build, ease of maintenance, available space, etc. Since you asked specifically about lower end cars, I'd say it's just that supercars have their preferences set very differently than low end cars. Nobody cares if this car doesn't have good boot space, or is expensive to repair.