Suggest setting a "surrender tendency level" for AI and preventing it from selling its last piece of land. Why? Because someone in our group has developed a "rogue style" that allows players to quickly annex large territories and achieve victory like "rolling snowballs, getting bigger and bigger".
Some people abuse their territory and exchange huge profits for just one piece of land, sometimes even saving money to buy the entire country of AI.Someone in the group joked that "warnament" should be called "warn Purchase and sale of land"
I hope there will be a rebellion on the land, so that no one will raise taxes and wait for them to money increase