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I do think that you can draw some conclusions based on posts on CC. They are mostly in the category of existence proofs (i.e., there exists student X such that X has a 2400 on the SAT I + a 4.0 UW GPA + add other qualifications here, and X was rejected from College G). In order to discredit the existence proof, you would have to claim that every post by someone claiming to be such a student was a fabrication.
the chances of getting into a school when you are not in any of those categories and have no national recognition in anything are about zippo.