Good for a percentage of people, but not all. Good for the progress of space exploration and travel, but not good for the economy at large. Excessive wealth concentration doesn't economically improve the lives of ordinary people who struggle with the basics while the rich get richer.
See, you're doing it again. Shifting the argument to wealth inequality and saying - in effect - that if we can't fix the "rich getting richer" problem, everything else is a waste of time.
Have you ever heard of Danny Thomas? He was a Hollywood celebrity, and the star of one of the most successful sitcoms ever. He got rich as an actor, comedian, producer, and businessman. He accumulated considerable wealth. He also helped to found St. Jude Children's Research Hospital. I've done some work with St. Jude. It's an amazing operation, and I bring it up because of a conversation I had at a meeting a few years back with their fundraising team. I used space travel as an analogy.
I said that St. Jude was basically the NASA of cancer research. Back in the 60s, a lot of people looked at both of these endeavors and said "yeah, launching people into space? Sitcom star's charity? That's noble and all, but we've got bigger problems to deal with." Fast forward 50 years later, and we've got satellites giving us everything from traffic directions to weather updates, and oh by the way the rate of survival for childhood cancers had skyrocketed thanks in no small part to some rich Hollywood celebrity's pet project.
The problem of wealth inequality is not something that's sprung up recently. Bezos, Branson, and Musk are not a new thing. Do we need to work on this problem? Yes. Should we stop every effort by rich people who are trying to do good and say "excuse me, but we need to appropriate your wealth through taxes, distribute the money to the masses, and then maybe get to sending people to space and curing cancer?" No.
We can walk and chew gum at the same time. If Branson wants to throw billions at space tourism in the meantime? Great. If Clooney wants to throw millions at Darfur? Great. If Gates wants to donate 95 percent of his money to world health issues? Great. Rich people are throwing money at problems. You seem to be saying "we can't do anything until we stop them from being rich...and only after can we get some important work done."