City forge point production is useful. Sure. (I can get 960 fps just from my PH's if I get lucky with my BG)
But with enough camp support in GBG you can make a ton of stuff (diamonds, goods, military units, etc) plus thousands of fps ofc
(To the ppl who don't spend a dime on the game: good for you. I respect that. But some ppl do spend dollars on the game. That is their choice and you shouldn't feel jealous or feel the need to aggressively defend your own stance. Chill out. Its a short life. Enjoy it and respect one another)