That's not a super high bar. Most of these founders could get $200k jobs at top tech companies, invest $100k/year, and be a millionaire in ~10 years. Much better than 10% odds!
Investing 100k/year seems a bit much. With ~40% tax, the take home is closer to 120k. Add in Bay Area rent, leisure, random fixed costs(car insurance, significant others expenses, pets, etc) and its probably closer to 80k at best.
Though, I do wonder, how feasible would it be to end up with a 2+mill nest egg(or however much you need to live off the gains) by ~35 and retire right then and there.
Founders also get paid well at startups once they've raised funds. There's a large difference between having a couple million dollars amassed as retirement savings and having millions amassed long before retirement. The lifestyles and opportunity spectrums are wildly different between the two.
