put guilds at a limit of 100 tagged players. Thats enough to down the current era content, but not enough to get everyones alt tagged into the guild. You will still have a lot of collaboration between guilds but you'll be in a situation where you have people spending time elsewhere despite that just because they can't play their alts in their main guild. It worked out a lot better for vz/tz, even though it has flaws of it's own such as guild collaboration. You had more options, you could play your main with one guild and then go play your alt in another guild that would fight your main guild. It's kind of a moot point though since player suggestions seem to be regarded as insults.
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