There's an interesting debate in the comments about Mr. Musk's personal goals -- gives some good insight to the rest of the piece. TL;DR -- cares more about Mars+mass EV adoption (see: open sourcing Tesla patents) than about the cash; money-as-means to get to Mars and get humanity "off" carbon. With the read I say.
This is just a "wouldn't it be cool?" There are no meaningful deductions being made.