Why not? Because they can mate it to a 2nd stage that costs about $10-15 million and then sell a flight for $40+ million. Not only is that a hefty profit margi

Why not? Because they can mate it to a 2nd stage that costs about $10-15 million and then sell a flight for $40+ million. Not only is that a hefty profit margin, it's a full-scale, live-fire, "all up" test of reusability, all on someone else's dime. This has been SpaceX's genius move since the start, they've been developing reusable rockets which normally would be a multi-billion dollar R&D effort. Except they've been able to fit that development program into a commercial launch business, so that the vast majority of the costs have been subsidized by their customers. Instead of being chumps who spend tens of millions of dollars per flight of their own money to test hardware, they get the same testing, or better, while turning a profit. And that's why Blue Origin is still working with incredibly small sub-orbital boosters that are not even in official service yet while SpaceX has been making money hand over fist for years and has also managed to pioneer reuse of orbital launcher stages (while at the same time doing R&D for manned capsules, next generation methalox rockets, Mars colonization, etc.)