Well in Barovia the people are so frightend of nightfall, and vampires, they dont walk the streets at night. Vampires wouldnt have a bountifull selection. Vallaki is a starting area for new players, we have large spawns of rats/dire rats, and wererats, throwing vampires in the mix ups the CR rating of the city by a lot, theres a very good reason for it. Also I think vampires heres tend to be more ferral and wild, not the overused gentleman vampire that everyone is hell bent on playing and refereing too.