As if what's going to happen depends on the ensemble average of predictors.

Tell me why the lone economist predicts that there will be (and there will) an economic crash not how many

Polling an ensemble of experts is much better than asking a single one, and there are some that vote 'not sure' or similar in those polls so it's hardly a coin flip.

Economists aren't really experts, though, as demostrated by the very fact that there's a 42-58 split.

You wouldn't see that in any field where there's genuine expertise (e.g., mathematics, engineering, medicine...)

No. A only a reasoned argument counts for anything, no matter how many. Everything else is auguring.