I’m not sure what the intersection is of people (1) rich enough to do this, (2) willing to slum it in a tin can where none of the wealth they’ve accumulated thus far would even let them retire because the entire economy has to be constructed ex nihilo first, (3) have nobody binding them to Earth, either because they don’t exist or because they came with them to Mars, (4) is not too anti-social to function despite #3.
Don’t get me wrong, when Musk first announced this I was very interested, and could just about afford the target price. But then I tried a much more minor relocation — Cambridge to Berlin — and found myself much lonlier than I’d been primed to expect by my experience moving to Cambridge in the first place after I graduated.
It might be fine, I just wouldn’t assume that now.
The uber rich person doesn't necessarily have to be one that goes. It just so happens this one wants to. Some uber rich person could see it as just another way to generate money, so funds the endeavor while spending those earnings on terrafirma.