they will be able to tell how many are going to zone control anyway simply be logging on and asking, not everyone in the faction is going to go fight in the same place necessarily.
But maybe you are right.
But it works the other way too, if there are 4 brahmin boys, and 60 Vtec they will know ZC will just be a waste.
What if you just had a daily faction status that updated say once a day?
Lawyers: 40 people played lawyers today
Vtec: 35 people played Vtec today
etc etc.