That's an interesting question. Part of the answer here is that I suspect that Elon is not driven by money other than as a tool to achieve his goals. In other words, even if he loses control or if profiting from his creations is not his personal goal he still will make a bunch of investors with some probability quite rich as long as they let him move towards his own goal.

In a way for an investor it is very nice to know what makes the founder(s) of their portfolio companies tick because it makes them more predictable.

If the route to Mars for Elon goes through profitability of SpaceX then I would hate to be in the way of his particular brand of steamroller, regardless of whether or not he himself benefits from that in a financial way.