There's also other rights/benefits that come with it like implicit transfer of estate, access to a loved one in a hospital due to being "family", and ability to share insurance.
Other cherrypicked examples, Dave Grohl and Clapton famously had no formal training and just learned by listening to and emulating artists they liked. I suspect they make over 20k/year.
Dave Grohl knows his scales now. Yes, if you make a band and become successful you can call yourself a professional without music theory. If you go back to what I said though, I said as a degree.
Most of the billionaire tech CEOs that I've seen get stock comp in RSUs which are taxed at time of vest. That may be different in other industries though.