If you expect rage quit decks, play counters. I immediately ban if there's a problem with balance, not with monotonous metagame from players. That said, banning SoG's would've sped it up and allowed for more different kinds of decks, so it would've been a good move for that separate reason. I'll definitely keep it closer in mind in future upped tournies.
@kobis: I did not swiftly dismiss it at all. I explained why I hadn't done it. People complaining is due to the different reason I stated above. Sass doesn't help anyone here.