Because that is a very, very, VERY narrow and hard to hit target. It's intentionally limiting both the upside AND the downside.
If that's what you end up with, hey that's cool. There are far worse outcomes possible in the world, and that one is pretty decent.
But why not be open to more? Especially when starting and planning.
After all, if things go well enough, you could do the same with $1 of salary.
None of that necessarily requires VC either, just an open mind.
Intentionally saying 'I don't want to make enough money to be wealthy' at a job which is based on building a machine to make money, is intentionally handicapping oneself.
Think of it like setting a required minimum latency for a UI or API that you would intentionally never serve a response faster.
Folks are welcome to do whatever they want of course, and if my competitors prefer to do this, that's cool by me!
If someone doesn't trust themselves with the potential success, I could also understand that. But maybe it would be worth working on that part first. Because that will be a huge problem regardless.