I'm curious about this too. As far as I know they have the same handle, same lock, and the same steel, so the only difference is the blade shape. Doesn't seem like enough of a difference to justify a $100 or so price difference.
Of course there must be something to it, because I would buy a Vector for the $240 or so they go for, but not a Kestrel for the $130 or so that they go for.
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Jason aka medusaoblongata
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"I have often laughed at the weaklings who call themselves kind because they have no claws"
- Zarathustra