[fsckboy]

if you have no knowledge of any inside information and you are trying to make a buy/sell investment decision, your decision benefits from the price being as accurate as possible. That is what every individual is "trying to solve" so it's a net benefit.

[airstrike]

except there is nothing to buy/sell here other than the prediction itself.

Or do you also think it would make sense, in a hypothetical scenario, to buy options on a stock price that is already known by some in advance? There’s a reason you’re not allowed to trade on insider information. You’re totally missing the point here.