You are talking about two different things. If somebody finds a question that matches his problem and the question has, say, 1000 views and none of the answer provide a conclusive solution then that is a valuable question. You know you'd better start looking for another approach.
Not having such a question marked answered is utterly logical, there is no conclusive answer. It would be nice if somebody posted that there is absolutely no answer and that answer could be accepted. But that doesn't happen very often at SO. It is far more difficult to prove that there is no answer. And such an answer doesn't often get appreciated, I usually just skip them.
If your answer rate is what bothers you then you could yourself post an answer and draw the conclusion that there is no answer. And accept it. When you get a downvote on it then take another look. Built-in notification for a better answer.