I've no idea--I figure JKR just didn't think about it, but my guess is that Vampires are sexy and werewolves are savage, a common stereotype of the two. They may also be less contagious so that a vampire bite doesn't turn you into a vampire. It may be something you're born with instead of having to be a person who contracts a disease over which they have more control.
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timeasmymeasure
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Date: 2006-11-01 01:42 am (UTC)