It’s very simple. You should expect he will do whatever benefits himself.
So yeah, he’d YOLO and do the Mars trip before any of the above. Which is what most nerds on HN would love, except their blind hatred for Musk would make them despise even that.
There's no way in hell I'd even remotely consider trying to build a Mars base if i had all that money, either. It's a fucking stupid way to waste money.