That plane rides cost so much is an accident of our timeline, of when we are born. In our timeline, we employ transportation technologies that are so intensively consumes fossil fuels. That we never have enough fuels is a quirk of this planet. We are lucky enough that planes exist today. When we buy a plane ticket, we ...aren't even paying for the plane ride. We are paying for new experiences, the potential for human connection. If you are convinced you will find them in Europe, Africa, whatever, it seems accidental that you are born in America.

On the other hand, it is no accident that a single driver owning two cars costs twice as much. Some kinds of greed are inexcusable.