However, it turns out that making routes is HARD.  It's easy to make an easy route, but it's hard to make a difficult route.  The only way you can get better at climbing is perpetually doing things that are just out of reach (no pun intended).  If you're climbing space is private, nobody else is ever around, so harder and harder routes are nearly impossible to create.  It would create a stagnation in your skill and you'd never advance.

And so goes the normal pattern.  If you want to advance or increase your skill, it is imperative to surround yourself with people better than yourself.  So the idea of having a personal climbing gym falls apart.

Luckily, owning your own hovercraft might not fall into this category.  I'm still going to do that.