>> I suspect frequent requeening is one factor. What are the others?
>
> Apivar. Fumagilian B. Education. Motivation. Diligence.
Another key word I was groping for (it is still early here) and perhaps
the main factor is PRAGMATISM.
Another factor in this analysis is survival bias. The big operators who
can't keep bees alive soon become small beekeepers -- or ex-beekeepers.
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