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At this point in our evolution as a species, what incentive does another civilization have to spend the intensive resources it would take to make contact with us? We have nothing to offer, unless we ourselves (food, labor) or our planet are the resource. Otherwise, the only reason I see to make contact is because you can do it from a distance, but the communications lag makes that an endeavor that is unlikely to return a result in any biological being's lifetime, so why do it, and also, why risk calling in the guys who are likely to see you as a resource?