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Again though, I don't really see how a guild full of red players can survive for anything longer than a day or two (if that). Any character that has gear better than utter trash would become a juicy piñata for any other player. A "red guild" suggests that its members have good enough gear to PK anyone, or they're running around in PKing groups, at which point it's bordering on griefing.
If a guild is known for being red and known for operating in a certain node - pretty much any guild even remotely close to their location will constantly be on the hunt for those red players. They'll have a single BH to know the location of the reds, but they'll be attacking with their greens, so that it's way easier to kill the reds. And then those red guilds will just lose a shitton of time and money on trying to get back to their full powerlvl. And with each PK they'll just keep making it worse for themselves.
Also, seas won't have corruption, so if some group of people want to protect an island (I'd assume it's gonna have something valuable to protect?) - they can just attack any nearing ship, instead of risking corruption for no reason.
This is why I'm saying that I'm sure there's gonna be no red guilds, especially if the corruption is tuned harshly enough to deter corruption to the point you're describing. The risk is too assured and too great to attempt it.