3) Audience acclaim is a poor indication of certain categories like "Best Editing, Best Choice of Music, or Most Original". The average fan is not an AMV maker, just an AMV watcher, so categories like this are better left to a panel of savvy judges.
I apologize if this is a repeat of previous comments. Just wanted to add my two cents.
That's the reason the contests I'm coordinating have best video voting by audiance, as well as a best video by judging. All the best artistic, etc catagories art judged as well... This is the best way I found on balancing the two.... This is not to say other contests are not fair or do it wrong, I thing it's great having a variety of methods applied at many different contests and some work better at a particular convention. Since there are so many contests thease days, people can always choose which to enter if judging to them is an issue....