I'm not. It's not about having more money to spend, but having enough to be permanently secure.
The founder could have FU money, still draw a ~50k/yr salary and keep their spending at the same level. The only difference is that if circumstances change the founder is still secure instead.
If you’re already doing the thing you would do if you could do anything, do you still feel the need for “enough money” to walk out and go do it. I think, and some other posters seem to agree, that the answer is a qualified no.