What makes You think guilds will still want to team up and try to swap if they cant do more than 300 fights a day per player and 2 sectors are 320 fights in diamond?
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If this is going live, it will transform the players thinking similar to the very beggining, when all they did, was to spend atrition in GbG, few goods here and there and that's all for the day, people will lose their enthusiasm just for 200-300 fights a day, and will prefer to sit with the sectors or quit, just because there are 3-4 "hyped players" and ultra active for fps/diamonds in a guild it will not change something too much, just the first swap of sectors in a day
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Another aspect that will increase hate between guildmates will be the share of atrition at the beggining, I wonder how many will sacrifice for the other players in the guild to use the maximum of 66.6%, everyone will want that
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But time will tell.