I thought this was weird two. I think treaties should last 20-30 turns. ATM pretty easy to rack up on credits per turn by trading for that instead of lump sums of gold.
Each turn is supposed to be a week, so you are saying that treaties should be renewed every 6 months?
If you trade 4 techs to a minor for 100bc per turn it will take you over 75-100 turns to get what they would have brought for cash and you are risking that the minor gets destroyed long before the turns elapse. When you buy on time it always costs a lot more.
Do you think it is mean to collect payments from the AI?
They have already done a balance pass on trade values. I hope they don't change a thing, but if they do...mehh