So far with the 3k purse, I'm seeing mixed results. There are large armies around, but not as many as before. Many nations are accumulating large treasuries, but I don't think that's going to continue. I'm at about 1150 and about half the factions have around 120k stored up. However, their income seems to be leveling out now, probably because they have high maininance costs on their armies and they finally have lots of buildings to construct since they have all expanded into the rebel territories. Some nations are actually relatively low on cash. I would say these are around the 10-25k region and on the downward slope. I expect the 120k factions to start decreasing soon as well, if the graphs can be believed.

I am going to keep playing this campaign, but I'm starting to think that 3k is too little. It's enough to get them all off the ground with a great start, but not enough to keep them growing and pumping out armies throughout the game. I will try 5k next time.