Well, the faster you grow an account, the more the interest produces. 10% on 1,000 is 100 and 10% on 10,000 is 1,000. So you are not wrong...but high returns generally require high risk so its not guaranteed. If it was, we would all be millionaires by now.
The return on Tesla has been great since their inception 15 or so years ago but if Tesla went under you would be out all the money you put in them. The S&P 500 has returned an average of 10% a year over the last 100 years. If one company goes under, you dont lose all your money.
This is what high risk accounts look like.
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