There are way to many I can't even go to all of them especially if its going to happen on the same day as another billion of them. Yes I am exaggerating. :D
If you make a garlic piece for your wall I don't think they will show up. But yes Vlad can break in and drink from your sims. Like I was playing tonight and Caleb showed up at my sims doorstep. :D
I basically bought the Werewolf pack for the world I think its gorgeous. The other 2 I like my sim to be a spellcaster and vampires I could careless about. I just let them be .
I actually like the spellcasters better then any of the other occults we have. I mean I haven't really truly explored Werewolves yet but I love my sim to do magic.