I have flagged many questions on Stack Overflow as duplicate and the flags are dismissed as helpful by a moderator, but the questions are not closed. One example is a question regarding Android development in C#, which is definitely a duplicate of another question here, here, and here.
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I often mark a flag as "useful" because I can understand why the flagger flagged it, but ultimately I disagree with the flag.
For example, if I see a question linking to a dupe, and it's pretty close but not close enough, I still mark it as helpful because they had a pretty valid point, and I don't want to discourage them from further flagging - even though I'm not going to action the flag.