Why are we making such expensive fuel efficient cars?

The hydrogen fuel cell car by Honda, The FCX Clarity, costs “several hundred thousand dollars each to produce, though [Mr. Fukui] said that should drop below $100,000 in less than a decade as production volumes increase”. Now the whole world needs to drive cars like those, but considering the average American only makes $48,201 annually and we have the 3rd highest gross national income per capita, only the upper-middle class and higher will be able to afford such cars. That means only a little bit more than a quarter of all Americans will be expected to have enough money to buy one, buy that doesn’t mean they will. In fact it would be reasonable to say that only half of those people will actually buy one. We have the capability of building cars at cheap prices with up to 7,148 MPGs, but we only build cars that get up to 48 MPGs. Why would we waste time and money on cars that make us unhappy with costs of almost 4 dollars a gallon and higher just to operate? What do you some of you think of the subject, what are some of your theories of why we don’t use those cars(I have some but I don’t want to share them to give you ideas, or to change your own), what are some of your ideas of what will happen if we don’t find some better fuel?