First, awesome mentioning of of one of my favorite games, civil 2.
Second, I always like the practice in BM of comparing gold to max pop of regions, and then with region types. Usually I like to see a lot of mountains with stable food supply- they provide great wealth per pop, are much easier/cheaper to feed due to lower pop, and investments are more powerful there than in cities. Not to mention, aside from better investment returns, the usually longer travel times help to prevent nearby enemies from damaging the investment, or at the least give you the time for early taxes so it can't be looted away. That's one thing I always liked about central BT before the blight- rich mountains, efficient cities, and great rurals all in one place.
