RK47
collides like two planets pulled by gravity
It will piss off all my vassals? What if I don't have any county level vassals in that duchy yet? As in, I personally hold the duchy and all the counties. Would it then only piss off barons and such in that duchy (which I wouldn't really care about - odds are I just conquered them anyway and it's not as if they are in any position to oppose me) or ALL my vassals, even those not in the duchy I just destroyed? Because that would kind of suck.
No, only the vassals that belong in that duchy.
If they really wanna balance the recruitment of nobles - they shd just charge 20 gold and 20 prestige for Inviting Nobles instead of the scaling up cost... that is pretty ridiculous once your domain grows.