They say it takes multiple streams of income to become wealthy. I would agree.
However, it may be beneficial to be reminded that multiple streams is also attractive as a form of risk management.
It’s less likely that a person with multiple streams will fall into an ability to repay their loan than someone with just a salary.
Losing a job happens all the time!
Perhaps the strongest from of income to a banker would be multiple (even up to 7+) triple AAA rated companies on a contract basis.