That's all. There is nothing more to think about while voting. If you think there should be more things to consider while voting, please explain what and why.

• "This comment deserves to be at +5, not +40. The voting is totally out of proportion and I would prefer it were encouraged to a +39 degree than a +40 degree."
• "The parent is at +8 while this comment is at +1. It is an undesirable thing for there to be such a difference in karma between these two comments because the reply is at least as good as its parent. I am going to upvote the reply."

I certainly support the heuristic: Upvote = "LessWrong discussions should have more of this." In fact, I've been advocating it for long enough that when I first advocating that interpretation it provoked controversy in as much as some considered it too cynical compared to more pure ideals along the lines of votes being obliged to mean "the point in this comment is rationally coherent". That said, it isn't quite the only consideration that it is reasonable to take in to account and I apply both of the heuristics mentioned above from time to time.