

Because the world has actual things in it like people, wildlife, culture and history. Space has none of those things. Unless you’re there working as a scientist to study things that can’t be studied on earth, it’s pointless.
As of now it’s a glorified roller coaster. At its best private space travel could be Disneyland in space. At worst it’s just rich people paying to be carried up mount everest for clout but with exponentially more resources wasted.
I understand from your comment that you’ve read too many sci-fi books to understand what a massive resource sink that would be with negligible benefit. It’s pretty basic physics.
We’ve already got cheap transportation, look how that’s turning out for the planet. But I’m sure burning God knows how much energy to launch more junk into space will save the world.
We’re already approaching a critical mass of private equity space trash in orbit, what’s a few more lowest-bidder megastructures? At least the ultra rich will get their life rafts while we burn.