The whole point of a diversified portfolio is to get rid of unsystematic risk. Unsystematic risks are things that don't effect the market as a whole, only certain industries or companies. Things like fires, floods, "CEO quitting/death" etc.
I'd be way too scared to put everything into one company, too much unsystematic risk for my liking.
But good luck to you! You may retire early ! Or soon be lining up at the centrelink office xD
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