Too open to abuse. Everyone would just use the feature whenever they are going to run a bit low on gold, say on a extended campaign in order to maintain their captains. You have been declared rogue, the game isn't supposed to be easy for you at this stage. I'm surprised you even had the option to drop troops as militia.
Fair enough. And I'm not rogue. I'm a member of a realm. But as I don't intend to stay there, I won't be taking an estate as I'm not sure I'd be able to take an estate in my destination realm if I have one in another or something weird like that. (idk how many bugs are still in the system, so simply avoiding the problem.)
I can drop troops as militia because I'm in my own realm based upon the above.