Here's the thing with "the people choosing what gets built", they obviously do. But main stream manufacturers build what the majority of people will buy. They can't afford to do otherwise.
There are independent production companies that build cars for people. Check out the Hauk line of vehicles, specifically the 'rock raider' or the 'river raider'. If you want it enough, you can buy anything. But it doesn't pay to mass produce these vehicles, which is why you don't see them on show room floors.