So does this not leave a loop hole. You have 6-7 cities, normal speed, and really need the reduced maintenence, you could build a virtually untenable city or two near ice or something that will never grow, leave it unmanned and build the forbidden palace else where. If the cities get taken so what, perhaps a you sneak your religion in the back door to an AI, and as they never grow the maintainence is vastly outweighed by the benefit of the forbidden palave else where. Or Have I not understood. this asumes you have built the palace before the redundent cities are taken, if anyone ever bothers.