I completely agree, especially since the cost doesnt scale with age.
500 gold may be reasonable early game, but getting a 12-15 population city with 2-3 free units late game for that same amount of gold is extremely powerful.
That being said, as a min maxer, I am curious what suggestions others have for policies and religious beliefs to best take advantage of this.
As a point of irony, ive found that the patronage tree is terrible because you dont usually stay allies with cities for very long before taking them over.
thoughts?