Valkrionn
The Hamster King
We plan to. 

Support Costt = ((NoF * 1.5) - 2)
Support Cost per ind fort = 1 - Tiles From Capital / 2
The Master buildings also allow access to additional promotions, so they might be worth building for that reason, depending on your specific game situation. Those promotions have to be purchased with gold, but still.
I don't know how good the AI is about taking the additional promotions that the Master buildings make available, so that might be something for the team to look at.
And yes, the primary purpose of the Master buildings would be the equipment promotions. If you don't want those, then you won't want to build them.
You only need one for that, and you don't build the first one, you expend a GP for it. So, no, they're not worth building for that reason.The Master buildings also allow access to additional promotions, so they might be worth building for that reason, depending on your specific game situation.
Sure they are, unless you want to funnel all your troops through one city.
Most games my troops are built in only one city, so that's hardly a negative. Certainly not worth spending ~600Sure they are, unless you want to funnel all your troops through one city.
Most games my troops are built in only one city, so that's hardly a negative. Certainly not worth spending ~600elsewhere simply for a minor convenience.
Then of course you don't see a use for it. Not all buildings are designed to be attractive to all playstyles, nor should they be, IMO.
Anyway, all I'm saying is that it would be nice to have these very expensive buildings be useful commensurate with the difficulty to get them into play. (Plus, the problem that their concept is a specialist which helps troops while some of their function helps non-troops.)