The difference between a wealthy investor and a middle class investor is far greater than scale.
Wealthy investors do not buy the same common stock that middle class investors do, they purchase preferred and super preferred stocks that pay orders of magnitude more in dividends. Good luck purchasing any of these as a commoner, you buy these shares in special arrangements and in large volumes.
Wealthy investors pay less of a percentage in brokerage fees and get other hige advantages on exchanges when trading.
There is an old saying, “For a man to turn 2 million into 20 million takes patience, but a man who takes 2 thousand and turns it into 20 thousand takes skill and luck.”