[Ironhawk]

No, I disagree thejeff. IMO, inverting the fort costs is more likely to actually happen than most of the suggestions in this thread. The reason being that it would take only a moment of JK's time to switch around a couple of integers, instead of coding up some new formula.

And things being thematic doesnt really concern me - you can make anything "thematic" just by wording around it properly. What matters more is giving interesting choices to the player that promote more fun and better gameplay. This does both.