Earlier quoted context omitted.
Have you read Founders at Work?
Yes.
For example, suppose I want to take a year off and go hiking. I could have worked that year instead, made 100K, invested that in the stock market, and be a multimillionaire by the time I retire. So from a financial point of view, going hiking is a really terrible idea.
Or, suppose, I feel like taking that year and doing a startup. And suppose I have a 90% chance of failure. OK, you can run the numbers, and probably show that, on average, I'll do worse than if I took a job for a year. So, yes, looking at it that way, you can say that my starting a business is an "exceptionally high risk".
Except... what if I'm working on a project that I feel like working on?
A part of the interview with Steve Wozniak that I found quite fascinating was that he said he didn't feel like he was taking a risk with Apple. Sure, he could have worked all those extra nights and weekends and had it come out to nothing. Yikes! Invest all those hours, that he could have been working to make money, and end up with zero. But so what? He was doing something he wanted to do, that he found really exciting, building one of the first computers that people could own themselves.
Is there a danger that one will become overly caught up in a startup, and do foolish things? Sure. I been there. I've done that. If I had found the right mentor they could have advised me to bail on my startup a year and half before I did, and saved me a lot of grief. Does that mean that you "have to" or that it is "realistic" that you're going to wildly over commit? No. Just because most Americans are overweight and unhealthy doesn't mean that it is "realistic" for me not to have a moderate exercise program and eat healthy food.
it makes sense to double-down with money
hmm, I've already responded to this point, as far as I can tell. I'd be happy to expound more if someone wants a more detailed explanation, but otherwise I think I'd just be repeating myself.