I have not thought enough about this, but I have an initial thought.
Eggs are not a davar shebeminyan here in the USA.
Now you say, but of course they are! They are sold by the dozen!
Well I say that’s exactly why they are not. Davar shebeminyan is when they are sold by individual count, hence each one is a davar chashuv, but when they are never sold individually and only in dozens then it is the entire package of a dozen which is a davar shebeminyan; the individual eggs are nothings!
Again, I have not thought about this much, and I don’t remember the sugya well. It just occurred to me.