We all know the phenomenon that OPs repeat their question when they don't get answers on the first one. When I see this, I mark as duplicate, but then this text is tacked to the question:
This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.
Well, the problem is, the first question doesn't have an answer (that's exactly the OP's problem) and the last thing I want them to do is ask a new question!
Could we have the option when we mark as duplicate, to indicate that the question is a repetition? A repeated question should have a text that encourages the OP to edit the original question.