That's your opinion. I think most scientists think we are the only planet with life, or the universe is teaming with it. Since we have no evidence of the later, we can't discount the former.
As to the second part, sure, it's possible. But it doesn't feel very scientific. If life is plentiful, why bother spending 100 years here? If they are looking for intelligent life, as we do with our planet's species, why wouldn't they attempt communication? There is no evidence we are being "studied" and the logic for it doesn't work, which is why I tend to dismiss that theory.
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