I get something like 10000 in net profit over the course of a year without any inflation. Here's what happened in that England->France game I posted about earlier since my last post.
Consolidation of the New World mainly. I resisted getting involved in European affairs, though the Pope was always aggressive and eventually forced me into War with the Mamlukes. Of course, I went in and annexed Jerusalem straight away and released the Kingdom of Jerusalem as an independent state. Around this same time, I get it in my head to start trying to get France into the Holy Roman Empire knowing that I'd probably get elected fairly easily just by the size of the state. Took many, many, mannnnny tries to convince the current Emperor, Milan, to add Paris into the Empire, and thus France, but eventually he acquiesced to my insistence and when he died, I became Emperor.
Now, at this point of the Game the Empire itself had grown to encompass all of Scandinavia as well, which had properly fallen apart into a collection of random feudal states rather than just Denmark, Norway, and Sweden. In other words, it looked like the HRE to begin with. A few reforms had already been passed, but I went ahead and started accumulating more authority to start pressing for more reforms. Within a decade or so, I got to Revocation of the Privilege, which would make all HRE member states my Vassals. Of course, this doesn't fly over very well with large member states, namely Sweden and Bohemia, or the Lutherans and Calvinist states. They succeed from the Empire and we're immediately cast into war. Of course, being UltraFrance, I steamroll them and call in the vassals I got from the reform to aid me
I force Bohemia to release several large states that it had annexed, and demand some territory which I immediately sell back to the proper owners. Sweden, which I'm not interested in, asks for white peace, and I accept. The other states eventually are forced back into vassalage, or otherwise concede defeat if they were still in a state of vassalage to France but merely honoring alliances. I force the Lutherans and Calvinists to convert, including Sweden, which pushes my authority up again due to the 'A Wayward Sheep Returns' event when an HRE heretic state converts back to Catholicism.
When the war comes to a close, Jerusalem calls me to honor our alliance and help fight the Ottoman Turks. This marks the beginning of the Fifth Crusade. I join, and so do all my vassals. The Ottoman Empire finds all it's provinces under siege within months by Danes, Frenchman, Genoans, Germans and god knows what else. Jerusalem takes some territory, I take some territory and sell it to Jerusalem. The Crusade ends with Jerusalem grown stronger, and the Turks severely weakened, all their armies destroyed, their provinces devastated, their war exhaustion high. The Venetians attack, as do the Hungarians. At the conclusion of that war, the Turks barely still exist. Venice took most of central Anatolia, Hungary stretches down the Balkan peninsula.
Almost immediately afterward, Switzerland declares war on me, and is completely squashed. I don't know what they were thinking, given that I had a standing army of well over 250 thousand men, compared to their 25 thousand, and that's not including vassal armies.
I force them back into vassalage as part of the Empire, and force them to adopt Catholicism again. My authority rises. Finally, Renovatio Imperii. Become the Holy Roman Empire, inherit all member states, become the only meaningful power in the world.
Income; 10000 or so. My land force limit is some 800 thousand but I've no need for that right now, when even Sweden can barely muster 8 thousand. I have no credible threats, no real rivals that I need to fear. Just a waiting game now to get rebels to start calming down before moving on to the next thing, whatever that is.