Unlike other billionaires, Musk is genuinely and entirely driven by the goal of creating human civilisation on Mars.

I joined this movement (via The Mars Society) in 1998, a few years before Musk, but we know and are influenced by the same idea and people (esp Dr Robert Zubrin).

SpaceX is Musk's vehicle for achieving this goal and has 20+ year time horizons.

Tesla's purpose was to prove that electric cars could be successful in mass production. It has already achieved those goal and now it is just a way for Musk to fund his Mars goals.

It is far more significant that a SpaceX treasury person was at the event than if a Tesla person came. Also, SpaceX makes serious money while Tesla is still losing it.