Imm times, timezones, permas, etc.
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<br>Some people are more likely to play one class (Russians play Empire, Aussies play Herald probably..).
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<br>Sometimes an IMM, especially if it is a cabal Imm, will have many players who play at the same time as them. What's more convenient and fun than an Imm that plays when you play?
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<br>Maybe they're permas..
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<br>Or maybe they just notice when the cabal is weak/strong, and try to log on in the strong times, accentuating the effect.
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<br>I think it's a huge mix of a lot of things, and would likely make a good sociology thesis, if only people could understand the dynamics.