I said it was ONLY worth one ball, but what I should have said is "a maximum of one ball" (at least if we're talking about a free push rather than a free scratch.)It's worth nowhere near a ball. much less.
P.S. As SJD said previously in this thread "it's infinitesimal"
I still think it's worth more than infinitesimal, but something less than a full ball. It's worth a full ball when the opportunity to use it ideally comes up, the player recognizes it, and executes.