Otto, the company doesn't know how many pilot's are in Balpa though. As far as they know it might be 51% or 100%.
Yes they can guess, like you did with 80%, but they don't actually know.
The point is it is a no vote. They want to keep pissing people off they'll get a bigger no vote next time. More people may join Balpa if the next offer is as bad. Hopefully.