I find the nerf to vault to be a little excessive. Going from claiming 19 million to claiming 1.2 million means I max out my vault in about 20 mins then the rest is wasted. I'm guessing that it is balanced around having armies maintenance cost to make the difference but it will take me a VERY long time to make up 18 million in maint. costs. I just hope you did testing to ensure this ratio is good for the long run! a step down over a month or something would have made the change easier to swallow.

Can you give some light on how maintenance costs work? There are 2 lines for the unit upkeep and I can't tell what makes the second one higher