You could get a lot closer to being accurate (if that's what you were after) by having region damage top out at 50-60% and making it much more difficult to drive a region rogue. Though if it were up to me I'd have a sort of 'economy and warfare 2.0' rolled up in one where you added siege warfare (making local granaries far more important) but also reduced the ability to eliminate the food supply for a whole realm.
Well...we're actually planning some changes quite similar to those in the not-too-distant future (though the siege changes are a bit more distant).
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Timothy Collett
"The only thing you can't trade for your heart's desire...is your heart." "You are what you do. Choose again, and change." "One of these days, someone's gonna plug you, and you're going to die saying, 'What did I say? What did I say?'" ~ Miles Naismith Vorkosigan
