<p>Not answering Glen_b's comment does not seem to have anything to do with this question being a candidate for closing. I'd say that this question is simply too vague/too broad, so I closed it (if someone disagrees, feel free to vote or comment).</p>

<p>As about general question, if the question had some quality issues and the comment asked for clarification <em>so that</em> it is not closed, and there was no response, then it should be closed. The story is different if the comment asked for clarifying something, but nonetheless the question itself wasn't unclear, then there's no reason for closing it. Nobody is obliged to respond to any of the comments.</p>

<p>Personally, I <em>ask for clarification without voting to close</em> if the question is "almost" on-topic, can be easily made on-topic after edits (yes, this is very subjective!). If the question crosses the boundary of being on-topic more significantly, then I <em>vote to close and comment</em>, since we already have lots of low quality, "abandoned" questions with no answer. From my experience, usually if OP cares about his question they edit it, while in other cases we never see any response, so OP did not seem to care about answer to their question.</p>
