I’m going to approach this from the perspective of someone playing Kerbal Space Program. Early on in the career mode, you need money to build new rockets, gather science, and develop new designs that take you further into space. Without early on tourists, you’re sunk. They provide a lot of the hype and money so you can research/get to that next phase.
Real life is different, I get it. I doubt these celebrities paid much if anything. It’s just rich people doing rich people stuff.
That sounds like a time sink but I may give it a try lol