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I don't think it devalues the post, I think the "up votes" deplete over time abit, I know I have gotten a few around 20 bucks, now they are like 17/18. Im not an expert, this is just what I have seen.

I just liked one of @craig-grant posts, and it went from like $125.80 down to $124.92 or something very close to that...

Yeah, i don't have all the details about why it does that sometimes, but I've seen that too.