I've been giving away all of my excess money (I try to keep it under 50k) to weaker factions in my game (such as HRE, who got whooped by about 5 different factions at the same time all across their borders, or France, which bascially gets whooped by 5 other factions from all sides), but instead of manning up and building up their military, they became vassals of Hungary or some crap, and then you have Hungary (who hasn't teched up but now has an instant infusion of hundreds of thousands of cash) instantly recruiting another 3 or 4 full stacks of crossbow militia and FFK, it gets a little boring wiping out these kinds of inferior stacks after awhile. I mean, its past 1400 and you're coming at me with FFK and crossbow militia.....c'mon.
What are FFK?

Persnolly I find the only way to get the AI to stop recruiting low level Militia is to reduce the amount they can recruit once they get acess to better units. In my current V1.14 BETA i've seen Milanisse stakes composed of a mix of Italian Spear Militia, Genose Crossbow Militia, Armoured Seargents, Dismounted MAA, and Famiale Ducal, with over a quater of it being Familae Ducal. In a Normal game that stack would have mostly been Genosse crossbow Militia, Ballistae, and Italian Militia instead.