got any follow up suggestions tony?
Sorry for the delayed reply to this thread. I probably had some ideas around the time this was posted but have since been sidetracked with other issues. With that said and having wasted all of your time...
I agree with Hulla in his assessment of the "math" needed for the AI to make a decision to parting with any land. Especially any land possessing towns, villages, cities or possible resource hexes. Additionally, the AI needs to understand the purpose of the transaction; i.e. to end a war, to encourage another region to stop an action, etc.
It is never "cool" to mention another game; however, the Civilization games handled this event in a masterful way. Cities annexed depending on loyalty, cities being a "tradeable" commodity in the diplomacy to cause action by an AI player (start a war, stop a war, etc).