Ok, listen tough guy, you make that a two or even three way trip or whatever you need, do the math while the rest of us catch the rich and plunder their physical vaults full of gold coins which we will use to buy the rocket, and then we meet up again to discuss how to shove 'em up there kay
I've read Donald Duck comics back when I was a kid so I would say that my understanding of how the rich operate is pretty much perfect representation of reality, thank you.
To be completely honest, I wouldn't be surprised if Musk or Bezos had a pool of coins somewhere in their homes "just to see if it works" or "to have this experience", it's the least wasteful thing I would expect of them.