The mars thing is really a small part of what they do, although it gets the press. They are pretty much the only real game in town for satellite launches, and, I think ISS transport (especially since Soyez is Russian and there's not a lot of good will going on there...). Even Amazon uses them for launches. It's approaching monopoly status for critical infrastructure (we're very dependant on satellites as a society now).

Mars is a labour of love for future ambition, but it's not the main show.

Whether the root cause is historically poor NASA funding or not (I think there's a strong argument for competition and private sector IF it's properly governed, but it never is...), the fact is that we've created a situation where vast amounts of geopolitical control rest with a single person.