Why aren't professionals relying on selling options to beat the market?

I've been selling options for a few years now and seeing consistent, solid returns. As long as I exercise good risk management, I can see this becoming a long-term strategy to compound wealth and consistently beat the market. But this naturally led me to wonder: Is this too good to be true? I'm confident in the strategy and my execution capability, but I want to make sure I'm not missing any major blind spots. If systematic option selling offers market-beating returns, why isn't every professional/institutional investor doing it? They have far more knowledge, capital, talent, and resources than retail investors. It blows my mind seeing people throw around complex indicators, high-level strategies all the time, only to post 10–15% returns, make $200k a year, or lose money altogether. I'm like, what? Do they stay away because they know something we don't, or are they actually doing it?