I sorta get the idea behind this, but I think perhaps it needs to be scaled back a bit, especially when it comes to the Human player. I'm talking about when you're doing well in score/power, the AI will generally just line up over and over to fill your coffers with tribute. I could see the AI maybe making a decision of capitulating to tribute demands if I were to threaten them (while hating me more and more, etc) but I don't even have to do anything. They fill my coffers which gives me even more money to build/upgrade more troops which makes me powerful which makes them want to give me more tribute all over again. It's a vicious cycle that leads to their doooooooooom.
Anyone else agree, or do you all like the mechanic as it currently stands?
EDIT: Also, is there a way to get AI civs to like me more? Do I have to do the same "Here's some tribute" thing or is there no way to do so?