If we look at street rods, it seems like many people do 4 door street rods. Sure the 2 doors are more popular and desirable, but there are plenty of 4 door street rods as well.

In addition to the reasons already cited, another reason some may prefer a 4 door has to with accessing the rear seat as one ages. This is NOT a concern for young people, but climbing, or just reaching, into the back seat of a 2 door car may become more difficult with age.