I was gonna say the same thing. I have multiple companies, from sole proprietorships to s and c corps. I'm also in Santa Clara and a business license is cheap. Plus I don't see anywhere that props are requiring registration proof, and anyone can start a business simply by deciding to - no cost at all.
I'm very intrigued at creating REs so I think I will be signing up so I can get an idea of what's involved, and start looking for a developer to do the coding work.