That's possible, but it isn't currently the case. At a minimum, having a long vanguard 500 position has a roughly 50% + positive drift - fees chance of success. Part of the long vanguard 500 price bakes in the unlimited theoretical upside that comes along with it. Selling option contracts against that long position to give up that upside beyond a certain price reduces your cost basis and pushes your position's success rate over 50%. Repeated over many events creates a net positive expected value.
Even if there was no edge in the market, as in your premise, it's still the case that the upside of a long S&P 500 equity position is unlimited, and the upside of a long S&P 500 equity position with an option sold against it is limited, therefore would be priced to have a superior chance of success relatively speaking. More market participants would improve the price accuracy of risk, it wouldn't reduce the price of risk to zero.
As for whether its worth it, I think the aggregate effect is significant and, of course, is subject to the benefits of compounded returns, so it doesn't take much to severely outperform your other prospects in the long term. It's up to each of us to decide if its worth learning.
edit: typo
Even if there was no edge in the market, as in your premise, it's still the case that the upside of a long S&P 500 equity position is unlimited, and the upside of a long S&P 500 equity position with an option sold against it is limited, therefore would be priced to have a superior chance of success relatively speaking. More market participants would improve the price accuracy of risk, it wouldn't reduce the price of risk to zero.
As for whether its worth it, I think the aggregate effect is significant and, of course, is subject to the benefits of compounded returns, so it doesn't take much to severely outperform your other prospects in the long term. It's up to each of us to decide if its worth learning.
edit: typo