Currently, if you run out of free recruit kingdom invitations, it's 40 credits for a new one. That's a lot!

As I understand it, we're trying to grow the game. Therefore, recruiting should not be as difficult as it is. If a KD is unfortunate enough to use their free invitations on provinces that turn out to be inactives, or have other players leave for various reasons, it shouldn't cost so much to get replacement provinces. It's all connected. Get active provinces into active KDs through recruitment-> KDs war a lot and have fun -> people stay -> game grows.

I would suggest 5-10 credits for a KD invitation is more reasonable. 10 credits is already a lot for that in my mind and it's often the monarch or same person forking out the money for these things.