I have a feeling, though I'm not entirely sure about this, that the "invite only" system partly stems from the aspect of vampire lore that portrays them as OCDers of the most insane sort. Therefore, Vampire's need to be invited in because they're absolute sticklers for manners, and the entire rule of whether they're allowed in comes down to "Is it polite for me to enter?"
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Date: 2008-09-06 08:13 pm (UTC)