There are about 608k UHNWI ($30+ million net worth) in the world, and I'm not sure if even $30 million is enough to have a space trip be a tourist trip that isn't too painful, and you have to be the kind of person that finds traveling to antartica appealing on top of that. So I'm not sure if many rich people could even afford or care to do this kind of thing anyway.
But on the other hand, the shit that most green types focus on like plastic straws & grocery bags, meat, low flow showers, space tourism and such is usually very small percentage of actual environmental damage, while paradoxically ignoring the actual big causes such as gasoline motors, industrial processes, coal power plants, high water crops such as almonds, water & $$$ subsidies for agriculture, non-regenerative agriculture and fighting great solutions like nuclear power and EV cars. An effective environmentalist would shame people for buying almonds and tell them to eat pistachios instead, take the train / bike everywhere and lobby to get more nuclear power plants installed.
I think it comes down to a combinations misplaced 'personal responsibility & morality' principle because you feel powerless, along with dislike of the rich wrapped in environmental concern, where people would cut off their nose to spite their face.