Ideas to stop mass castle building for DOM_3

[Zapmeister]

Has anyone mooted the idea of charging maintenance on castles? If the ongoing cost was prohibitive, no-one would be able to lay down a blanket of castles. You would also need to beef up PD as Huzurdaddi (I am, BTW) says, so that flyers don't get a field day.

Maybe also make the maintenance cost of a building increase with its age, making you think about maybe demolishing some of those inner-kingdom castles that are not currently needed for defense of the perimeter.