How high does that probability have to be before it is a net gain?
Look at a realistic and common case: eight devs in a 30m standup.
That's four hours used up. Maybe once or twice a month one of those devs gets something out of the standup that they would not have gotten otherwise.
You're spending 80 hours of dev time per month for a payoff (at most) twice a month.
Is it worth it?