I wouldn't assume size of success is correlated with "having success or not." It's notoriously hard to predict what business ideas will succeed at all, let alone be mega-billion-success-stories. Many things could've gone differently leading to Bezos being a ten- or hundred-millionaire vs a multi-billionaire even in worlds where Amazon was successful. AWS, for instance, was not in the original plan.

I think the strongest correlations would be between:

"has safety net" and "has success" - one major factor here is not having a poverty mentality that would lead to panicking and quitting early

as well as between "has safety net" and "takes multiple swings if no initial success", for the direct reason of "can afford to do so."