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https://en.wikipedia.org/wiki/Lunar_resources

In situ manufacturing. You just have to send enough to build the thing that builds the factory.

It's not like satellites need anything like computer chips, which are finicky things to build that require parts with a sole supplier on the entire planet.

> which also includes shipping all of the people and supplies to keep them alive)

What do you mean, "people" ? I'm pretty sure Musk is only expecting to send self-assembling Optimus robots [1] to do the whole manufacturing.

[1] "pre-order now, expected delivery any time soon"

(Oh, those times where you try to be sarcastic and realize: "wait, maybe that's the actual plan".)

You can make propellant on the Moon (aluminum based solid fuels), and the energy to get into orbit or into deep space is far, far less that from Earth’s surface.