Militia just blocks all actions. There's no fun in two realms spending 20k in militia, and then 5k in mobile forces that are so tiny all they can do is stare at each other all day.
Exactly. If you can only muster 5k CS then you should die. Not survive on the back of 20k CS militia units you've recruited with gold.
I can see people being able to temporarily increase their militia CS quickly but it should come with a heavy price tag since at that point you are not going to really recruit that many militias. You should be recruiting mercenaries and they cost a lot of gold.
