maybe just its a XP thing or something
Yeah... I noticed that, myself. I just clicked the thumbs up, as a test. I don't see it being with gaining XP. I clicked thumbs down on a spam post & nothing happened with the XP as well. Maybe it's some of the spammers doing that.... thinking they'll gain XP. 
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I've been looking through a lot of threads and I find that often every post has one or 2 downvotes even if the post is good. What gives?