We could all work together to create the additional information about the villages. You know, engage in some real worldbuilding.
This reddit link delves into the issue a bit and highlights some of the problems with figuring out how economics works in Naruto based on the information we've been given.
Well, the first place to look for making an economy in SL RP is not the people nor the money, in my opinion, but the goods. Who is buying what in the SL world? In-game there are a ton of stuff to buy; mercenaries, dwellings, weapons, armor, booze, food, dwelling guards, mounts, specialty switch training, opportunity to win at gambling, healing, etc.
Most importantly to the in-game "economy", very little of this can regularly be obtained for absolute free. You need some jangle to advance.
In RP, that's not the case. Like, at all. However, we do have the advantage of having an in-game "economy" to base a RP-based one on. A village with more shops and things to spend money on, naturally, is going to have more general income (unless it's closed off and/or limited) than a village that has only free to do sightseeing stuff.
Getting back to one of the most important things I noted earlier, what would IC people buy and why when they can, for the time being, get it for complete free through the power of words?