Part of the problem was the time period. The country was in the middle of the Great Depression, and capital was scarce, at best; nonexistent at worst. You also have to consider why anyone would want an expensive aerodynamic car when there wasn't an appreciable market for them. Gasoline was dirt cheap, and there were no Federal laws mandating any type of fuel economy.
While the aero look was nice, power trains had not yet advanced for the masses. You could get some pretty exotic combinations with Duesenberg, Cadillac, LaSalle, etc., but most consumers just needed basic transportation.