It's more common for people who are in-between jobs to take things that would be otherwise compromise their monthly salary income. It's less common for someone to quit a high paying job and take on a risky endeavour.
Relatedly, the Tarzan strategy is another way to mitigate this risk (side projects or finding your next gig before just quitting the current), etc. Called Tarzan because you hang on to the next rope before letting go of the current one.