I think more than anything, it'll increase guild loyalty. I'm tired of seeing people put together superguilds with the best they can find, even if they hardly know each other. I'm tired of being asked "do u have a gst guild?" because you aren't a true member of your main guild if you ditch it to help another guild so you can win. US members stuck to the guild and didn't change guilds every month. Maybe practicing with the same team for months is a factor of success?
Also, US had no chance in the October GST since 3nVy hacked 8 members to the guild spar. It was pretty pathetic..