I actually favor deletion, if sufficient time has elapsed.

http://meta.stackexchange.com/questions/68155/how-big-a-problem-are-unanswered-questions/68298#68298

>  we could probably ignore the question score and just delete anything older than 30 days that has no answers posted. This is currently about 7,000 questions, vs ~5000 with score <= 0. I haven't figured out yet how to inspect the vote scores of answers.

To me this indicates there's something fundamentally wrong with the question.