One experience that Chris has had (and maybe he's simplifying) that I have not is being called a liar. Though it's been everything short of the actual word. The word "lies" has been used, and also "poison."
So yes, it is precisely the case that "believe" is the key word. But it's not a faith type of belief. It's the existence of excessive incredulity that will not allow me to be telling the truth because it doesn't fit the world view of the hearer. If one believes it is possible, one is taking the first step to believing the story of one who does it. Now we have some evidence (and corroboration) that it is possible and actually happens, and the hope that I have held is fulfilled. I'm certainly happy to amend my statement that treatment-free beekeeping can't be done on a migratory commercial scale.