SpaceX doesn't have to hit those price targets in order to be successful, they just have to have the cheapest per-rocket costs versus their competitors. They a

SpaceX doesn't have to hit those price targets in order to be successful, they just have to have the cheapest per-rocket costs versus their competitors. They also don't have to pass all those costs savings to their customers: they can charge exorbitant prices and people will still happily pay if it's the best deal around. I'm sure many people at NASA and JPL are aware that SpaceX has some pretty good fallback positions if their marketing materials turn out to be inaccurate predictions of the future and that their bargaining position against SpaceX is weak up until they have multiple vendors and competitive bidding.