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I've seen several times before that I got many upvotes on questions that are marked as duplicates, even after the mark.
Does it make any sense? I mean, is it constructive? Why should we upvote duplicates if there have been a better explanation of the same problem before? Why don't you upvote it instead?
Often finding a duplicate is difficult, it may be the same but worded entirely differently. In that case a duplicate can still be a good thing as it increases the ways a person could search for something and find the answer, as such the internet is better and an upvote may be warranted.
Additionally, given that we accept that finding the duplicate may have been difficult; a question that is otherwise excellent should still be rewarded to encourage similar behaviour in the future.
See Dr. Strangedupe: Or, How I Learned to Stop Worrying And Love Duplication for some more details on how some duplication is good
I upvote duplicate questions if I find the OP has put enough time to ask the question. E.g. Asked clearly, what he has tried, what's not working, added relevant images (if require) etc. May be it's lack of research efforts but it happen many times with me that even after searching a lot I ask duplicate questions.
However if I find the duplicate question in the Related section situated at the right side, I usually don't upvote since he could find the question while asking.
