tl;dr: Now my votes are broken, and I'm sad. (edited: "dl;dr" -> "tl;dr" - sorry.)
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I've seen this complaint made several times before, with people finding that their votes are apparently not having any effect. I've watched the discussions, not feeling I have anything to contribute, wondering what they may have done to trigger the secretive "vote-ignoring" logic that you tinker with.
I understand that you need to stay on top of the problem of people gaming the system, and that being too open just makes it easier for people to screw around and make the voting system less valuable.
But generally I rely on high-quality items bubbling to the top, so when I see a comment I think is valuable and yet which is low down in the pecking order, I upvote it. I take care, I try to add value, I invest time.
And now I've found that some of my recent votes haven't made a difference. The comments I thought were worth boosting continue to languish. The people I thought were worth rewarding haven't got the karma.
I've wasted my time trying to make the site more valuable.
So, while I'll continue to believe that things are partially random, but biased to having better stuff near the top, I'm no longer as confident as I was. I'll continue to scan the new submissions to see if there's anything interesting, and maybe I'll click on an up arrow, but I'm pretty disincentivized about bothering to spend time trying to add value.
The message is that my time isn't valued. You've encouraged me into taking without giving back. You've encouraged me to react without thinking.
If that's the message you intended, I think that's sad.
Here are two links to earlier discussions - there are more.
http://news.ycombinator.com/item?id=871202
http://news.ycombinator.com/item?id=233460
I'm probably going to do away with the display of point totals on comments entirely, because thresholds haven't fixed the problem. In that case I'll just use points internally, e.g. to sort threads, and then I'll probably go back to counting most votes.
Edit: Since I was planning to toss the threshold when I stopped displaying comment scores, I just reset it to 1. Also, since users asked to see their avg comment scores in their profile pages, I just added that.