Very fun and replayable! Trade and war are indeed the only ways to gain a profit.
I was trying to set temples in all cities, but there's no option for that if they are your vassal...
Anyways, here's a few bugs:
- Big sacrifice for locust event is free (even if it says -50/-50)
- Killing scribes in the revolt is free (same as above)
- Cattle tribute bugged out at some point:
As you can see, I have Large Tribute from 4 city-states, but I'm only receiving 10 cattle (the grain tribute works fine though.)