Why don't sedans have a rear windshield wiper?

I notice only minivans, SUV's, station wagons, and hatchbacks have rear windshield wipers, while sedans don't. Why? The snow and rain probably actually accumulates on a sedan's rear windshield because it's almost horizontal, so why don't they have a wiper? What is the need to have them on other... show more I notice only minivans, SUV's, station wagons, and hatchbacks have rear windshield wipers, while sedans don't. Why? The snow and rain probably actually accumulates on a sedan's rear windshield because it's almost horizontal, so why don't they have a wiper? What is the need to have them on other types of cars anyway, if sedans don't?

Also, I know some sports cars like toyota Celica and the acura one have a rear windshield wiper, but the majority of sedans don't.
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