All things are relative. I am not some gazillionaire for which money is no concern but I am financially successful enough that I look at money a bit differently that most. When I consider buying cars I expect a certain level of quality and craftsmanship that you typically only find in higher end automobiles. Given that as my baseline - the Model S makes a pretty compelling fiscal argument.
On top of that value and cost are not the same. The value represented by the Tesla can far outpace the cost factors between its sticker and those of a Prius or Fusion.
tldr; I am not in the market for a cheap car, I want a great car.