It's been stated previously that duplicates have their uses. They sometimes indicate that a particular question couldn't be found with however the user searched for it.
Now while merging is often useful it seems like it destroys the duplicate, which to me seems to diminish the "wide net" aspect.
At moderator's discretion, it might be worth merging the answers but leaving the duplicate as a locked, empty question that points to where the answers have gone. The original question wouldn't need a link back to the empty, locked version. But this way you still get that linkage.