i think there's a possibility that the main objective was to search for extraterrestrial life and they did, but with a huge project like this you definitely will have all sorts of scientists like biologists, climatologists, geologists etc.. and the geologists just happened to find this interesting grey rock called unobtanium (soon discovering its great potential) and so the operation soon got taken over by business people who only were interested in unobtanium :( there could be other moons with unobtanium but i guess it's easier to just stick with 1 moon at a time. also, the other moons may not be habitable compared to Pandora. the atmosphere is bad enough so having to live in sealed off areas is a hassle, but it could be worse (imagine trying to live on a moon like Io.....you couldn't >_< it's too hot)
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