I have on occasion had quite a number of questions I have left open despite having responses to them because they are not the right answer. After a while, this starts to affect one's accepted ratio. Should one care? Here's an example of such a question; not a bad question, just highly specific and hard to answer definitively.
Do I close the question? I don't think editing it will do much good - not much more I can do there anyway.
What's the best practice here?