Marxian economics (see labor theory of value) distinguishes in the Grundrisse between material wealth and human wealth, defining human wealth as "wealth in human relations"; land and labour were the source of all material wealth. The German cultural historian Silvio Vietta links wealth/poverty to rationality. Having a leading position in the development of rational sciences, in new technologies and in economic production leads to wealth, while the opposite can be correlated with poverty.[11][12]

All of these are great ideas to earn a little more spending (or saving) money! I agree that investing in real estate can be passive, but it also depends where you invest in! If you invest in real estate in a college town (which has many pros and can give you a nice deal of money), in my opinion it doesn’t tend to be passive! College students (even the more responsible ones) tend to cause wear and tear, making your job as a landlord non-passive.

To me the biggest reason for not quitting my job before have close to $10M is the cost of raising kids. I don’t see how it will work out for folks retiring at 35 with $1M saved if they plan to raise a family. Providing a good life, after school activities, travel opportunities, college, etc. I assume I’ll spend at least $1M per child to raise them from birth through college. (The average is ~$250,000 to get them just through high school and that doesn’t include many of the things I hope to do as a family)
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At the beginning of this year, as I was setting investment goals I came up with $2.4M as the amount of liquid cash needed for me to say “I quit!” That would put me in the Baseline FI category. It would take a truly horrible job for me to quit and settle for budget FI. I don’t think I could handle being FI on a tight budget for too long because I would get bored due to not having enough money to pay for experiences/travel which currently bring me a lot of joy.
I guess I’m in the Blockbuster Category, but living in the Midwest I’d have a hard time figuring out how to spend $300k/year even though the math says it is not a problem. I think the reality is most people who are super savers are going to get to Blockbuster eventually assuming they don’t inflate their lifestyle along the way. There is a lot of truth to more money not bringing you more happiness…I spend less in “retirement” than I did while working and I’m exponentially happier. I checked my taxable account for the first time this year and it in the first 11 days it is up more than I’ll spend this year, interesting times indeed.