Here is how I view 4 door cars, or station wagons for that matter. You get twice the car for the same money, or the same car for half the money. Those two doors only, cost a lot of money. If you want a two door, and the car is in this or that shape, you pay so much for it. If it was a four door, and it cost the same money, the car would be in a much better shape. A lot better.
And, if you happen to have a spouse and kids, a 4 door is much more convenient. Try having 3 kids in the back seat that wants out now, just right now, and you have to get out first. I do not have kids, but I have been one, and the ones in the front seat were yelling and telling us to be patient. But, I could clearly see that they were ...... for having to get out of the car all the time.
My late dad, he was a truck driver, and had a Mercedes Benz truck, with 4 wheel drive, and he used to say that a truck with 2 wheel drive was only a half truck (since they got stuck so easily). Now, how does that equate to cars and doors, you get the picture. Who on this planet want to drive around in a half car ?
Bill