Quote by Metilda
Streak-voting is responded to when complaints are made. Here at Lush no one votes in the void. [Wait - maybe some do. It's up the author whether or not they want to permit voting from non-members. I don't allow non-members to vote on my work.] so I'm not even counting Streakers as something to 'allow' but rather something that happens [in any venue] and thus moderators deal with that when it's brought to their attention.
I honestly think we'd be better off with a 'like' button and nothing else. Low-votes are discouraged. Some people streak-vote for personal reasons. Others high-vote regardless of quality [to push a friend to win a contest - to give moral support to a new author - etc]. So the numbers mean next to nothing to me as they do to quite a few others.
I agree with your points about allowing only members to vote on stories, I do that too. Forced commenting can also help but even then, I had a friend of mine tell me if he reads a story that has forced commenting on it, he automatically gives the writer a 4! because he is being made to leave a comment. It hadn't entered his head the reason forced commenting was turned on was to try to stop nitwits from fiddling with scores. If persistent low scoring (and often from brand new accounts where there is no avatar) is given, we can inform the moderators but there isn't much they can do. Some people have multiple accounts in different places, home, work, etc... so they can sign in as several different people. There is absolutely nothing you can do about it.
It is just a nasty thing to do to someone. I know we are never going to be able to stop that happening but it is a real problem for any writer here, no matter how popular or good at writing they are. It is a real problem and everyone gets stung at some time or other.