chassis rigidity and 4 doors, that's allI think the only reason would be that someone has a family, one or two kids, and wants to be able to lug them around a little bit more comfy... thats about it?
i can do that too.1. A female will put out knowing that you have extra room in the back.
2. If you're going for a job interview, a sedan looks more proffesional/practical.
3. Sedan's are used in track racing, and so are M3's. Not non-M coupes.
4. If you have a family, or are expecting, you don't have to hear your old lady nag you to go buy a sedan. CUZ YOU ALREADY HAVE ONE!
5. If you go to a club and pick a chick, and her friends need you to drop them off or their girl can't go with you, you don't have to worry.
6. The wheel base makes it a better handling car than the non-m coupe.
7. Sedan's always out sell non-m coupes everytime.
8. Is it just me or do lip kits and look better on sedans?
9. Extra space if it is necessary to drop the seats and haul stuff.
10. Sedans are just pure sex.