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SpaceX is a few bells and whistles away from a human-rated Crew Configuration of the Dragon spacecraft with seating for seven. Their initial contract for unpiloted cargo flights of Falcon 9 / Dragon to ISS charges an average of $133 million per flight. At the same rate, they could sell passenger seats for only $19 million.

That's just a back of the envelope calculation with a gazillion assumptions, but useful for making projections for the next few years.