Fermion
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A return of 300K on a million of capital at risk is easily doable with the returns I have seen, as long as you are selling covered calls and puts. I have several puts I own now, which I would be quite ok with having stock put to me that are returning 40%+ annually. The downside is you must have this as a quite active hobby. The risk is really lower than investing in the stock market, the rewards are lower in upside, but the offset is consistent income.
Had I been interested in TESLA I think you could easily earn 40% of the share price in a year if you are willing to own the stock.
Ok, so do that consistently for 20 years.
1.4^20 = about 837x your investment.
So by selling covered calls you could turn 1 million into 837 million in 20 years.