I'm playing my current game Castille.(1370 AD) I now lead a large Kingdom. All of Iberia, half of Toulouse and Provence. I have 3000 gold. I get 40 gold/month.I only use normal tax settings. All of my holdings are maxed out. I can't build anymore due to tech. I am so large Mercenaries are useless. I just call up my vassal hordes and Blitz the opponent. It takes longer to walk levies to war than war itself lasts. I checked independent states on ledger. Genoa my new favorite punching Bag, has 35000 gold. WTF. when I war with them they don't even hire mercenaries. The only thing that costs money is Fabricate Claims. about 500 gold for county claim. I always press claim.
-maybe if you had to actually had to pay for vassal levies.After a certain length of call up.
-more Diplomatic uses of money other than gift.
-maybe initiating plots in intrigue screen should need money
Any Ideas we can forward to devs would be appreciated.