He could pay the same rates as deceptive web advertising companies and use a lottery system to give out the jobs (which have heavy demand at that salary and job-satisfaction level).
Or he could hire 1.5X as many people at the lower rates that they will gladly accept and get to space faster.
Surely this argument should then count for Elon Musk too and he should be happy to disperse the profits amongst the workers without making such a large amount for the [other] shareholders and himself. Sorry I should probably have generalised this para. as I don't really know enough about the earnings of Musk's businesses to know if he only took a regular wage and dispersed profits evenly or not (I'm guessing it would have been big news if he had though).