I guess the question comes down to the purpose of these contests, if you're going to start debating whether anti-trolling policies protect and encourage newer editors or just undermine the entertainment value of the contest itself. If you want a pure, entertainment-driven contest, then the doors are probably wide open to "trolls." If you want something else, then the doors can shut as tight as you want them. Regardless of which way it goes, someone out there will always have a different opinion about who should have gotten through those doors.
To address the topic of fairness to new editors from a different standpoint: I feel I'm in somewhat of an unusual position, in that I was a new editor who managed to produce an AMV which won awards at all but one of the five cons in which it was entered (Sakura-Con, Anime Boston, Tekkoshocon, AX). My purpose in entering was simply to entertain as many people as possible with this thing that I'd made, I wasn't after awards or notoriety or anything else. I also entered during a fairly short time frame of just a few months, without having any real idea of what the result was going to be (I had only desperate hope that I'd even make the finals). I recall being a bit fearful I would be labeled as a troll afterwards - while that was not my intention and I don't feel this is what I did, it still bothered me at the time. There were some other videos/editors on the con circuit which were getting a bad reputation as trolls, and I wondered how the average person could tell the difference between my intentions and theirs. Trolling can be an extremely subjective term. *
But actually - and this Lip Flapper discussion is the first time I've realized it - isn't this what the AMV community WOULD ideally want an aspiring new editor to do? Getting into the finals/winning awards at several big cons? I'm proof you don't have to be a veteran, popular editor to achieve this. It's not the name or the experience that counts, it's what you produce! Yeah, it's tough going up against really good, experienced editors...but that's sort of the nature of the game at that level. If you want to compete on that stage, you've got to bring your best game to the table, and if it's not good enough, well...how is that other peoples' fault? Get mad about it! Get inspired! Prove that you've got what it takes! Work your ass off! Enter a smaller contest!
Is this that generation gap thing, where some kids these days are so indoctrinated into the "everybody's a winner/special" mindset that they can't handle truly competing for something on the basis of actual skill? The older I get the more I seem to notice this is a state of affairs that actually exists.

*Throw in a