Giving the big points to submitters encourages people to keep submitting. Maybe one of the other five will get lucky next time.
Maybe if HN consistently registered the first submitted link and marked all others as dupes automatically. Even so, still seems a flawed reward system.
I upvote every submission of the same article that I find interesting
Still wrong in my view, and worth giving more value to comments. I've already commented anyway, not sure why HN does not automatically register the first time a link is submitted and redirect the rest to the first one.