<p>Yes; I also think it's reasonable to ask even if they don't comment&mdash;ask them to accept an answer or explain why it doesn't help them. But we do get a lot of users who appear once to ask a question &amp; don't come back again once they get an answer.</p>

<p>[@whuber's answer includes caveats I hadn't considered (in fact I haven't noticed such bad behaviour on CV), but of course fully agree with.]</p>
