Don't you think that maybe there were many accounts from the same IP adress, simply because in every house there are many people who live in common, and usually, they are many to use the same computer?
If a person vote, and so does his brother, and so does his sister, and so do their parents, and if they all live under the same roof... We have 5 votes coming from the same IP address.
Plus, I've seen that every band carrefully asked everyone not to cheat. If people have done so despite that, I don't think the bands should be punished for that.
Anyway, that's only my opinion, and I truly think that the top two bands have deserved to win this. Otherwise, if you really want to make it fair, it would have been even better (if one vote per IP address is accepted) to simply remove unnecessary votes, and retain only one vote per IP. Thus, all the bands would not be disadvantaged by all this. Even if finally it's not Sinaside and Greensleeves who win this, it will be two other groups who deserve it just as much.
Flittermouse