I do not agree with the optimistic estimates out of Spacex. Back of the envelope calculations, more detailed studies specifically for the Vulcan rocket*, and similar studies done by the European Space Agency are all much more pessimistic (realistic?). (But at least some of our oligarchs are putting some of their money to good use. I'll give them that much.)
* See, for example, Launch Vehicle Recovery and Reuse, M. M. Ragab, et al, American Institute of Aeronautics and Astronautics, 2015.
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