Musk is basically undertaking a moon shot: either a huge success or crash and burn. There's not much point keeping reserves.
I wish people would stop using the Apollo program as an example of an expensive gamble.
There was no market uncertainty. The problem was complex but the physics showed it could be done.
The overall plan was tested in multiple stages (which is why the first landing was by Apollo 11) undertaken with massive armies of bright folk overengineering the living daylights out of everything in view.
Meanwhile people call any old MVP a "moonshot" or a speculative research program a "moonshot" and it's just ... a poor analogy.
Yes, and they were explored extremely thoroughly by Apollo missions 1 through 10.
A mars shot if you will