Originally posted by Jaybe
Since Gandhi was your vassal, you could easily have slowed his research to a crawl by (1) trading resources to him for outrageous sums or (2) demanding gpt from him outright. (1) is actually the better route if you have resources he does not.
Vassal states adds a great variable to the game -- much more realistic with them. Instead of turning vassal states off, learn how to use them.
I hear you Jaybe. However, in another thread Alexman made a post which indicated that this 'feature' of being able to exploit a vassal for all their gold (via trading or flat out extortion) and ruin their research in the process was bad design and would be fixed in the patch so that vassals acted more like regular AI's in this functionality. That is, their available gold could be traded, but they wouldn't automatically keep dropping their science rate to make more gold available. This will greatly reduce the usefulness of this feature to human players.
So it would appear that the main (intended) benefit of vassals is the occasional monetary extortion, some free resources and the +1 happiness (which actually doesn't work atm.) In turn you get some diplo penalites and increased maintenaince costs. You need to weigh up weather this is worth it or not, but in some cases it still may be. What I really *like* about it is the fact that it is a strategic choice, not a given, that you get a vassal. People here complain about vassals like once you take a couple of their cities you're entitled to own their entire economy. Now there are various game balance reasons, which I won't go into here, why this is just absolute rubbish and would ruin the game, making conquest and wars even more powerful than they already are. Yes, a lot of the times capitulation is a bad deal and is not worth it - I believe that is intended. It's not supposed to be some 'reward' for almost wiping out a civ, otherwise there wouldn't be a choice at all! Even if its only worth it 3 or 4 times out of 10, as long as their are enough factors to take into account when making that decision, its still a good game mechanic for adding strategic depth.
Also, another thing of interest, which I haven't heard anyone else mention, is that your diplo rating with your capitulated vassal is very important for how much you can get out of them, which actually favors being a backstabber and going after civs which you are on good terms with. Sure, you lose a valuable ally for a while, but if you can get them to capitulate and still have a strong + modifier, you'll get more out of them as a vassal if they still have a reasonable sized empire.
RedFury