Basically, if anyone was asked to vote the post up, rather than seeing the post and thinking "I want more of this on LW." I apologize for not making that implication clearer. I've only seen this post at 0 or negative karma (but I'm not tracking it closely), which seems to me like people not wanting it to be negative rather than roughly equal groups liking and disliking it.
I upvoted the post because it had negative karma, and was not a post that I thought should be at negative karma.
In general I vote posts/comments in the direction I think their karma should be at. Thus for instance I downvoted Clippy's comment above because I did not think it was so insightful that it merited 20+ karma. I would not have downvoted it if it were at 0 karma.
I assume many people take this approach (it fits in nicely with consequentialism) so this probably explains what you saw.
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Benefits of playing: