====== How to edit building cost (by Guarder) ======
First go into GameMechanics, so into TownBuildingSharedStats and then choose faction. So go into the building you want to change. And then you see this (dragon graveyard edited by me):
TB_DWELLING_7
BLD_UPG_1
15
10
10
0
0
0
8000
DragonGraveyrd
CREATURE_BONE_DRAGON
15
Dwelling_7
0
Copy game mechanics into data folder and take away read-only. You see the red writing over there. Change the numbers to get the building to cost like that. ex: 10 to 1000