Well good luck to both of us then! I know when I had to make all of Charlotte's best friends they were all vampires! Which actually makes for a better friend because they live longer
Not always.
I'm playing a vampire in Sunset Valley right now who was turned by Nick Alto. The day after she vamps out, Nick invites her to a party, so she goes to hang out with her "father in darkness." While I'm at the party, poor old Nick is in a seriously foul mood for some reason. While she's talking with him, he dies of thirst right in front of her. No warning at all, no "desperate hunger" bubbles above his head, nothing. He just dies in a most grisly fashion. Holly was still a teenager at the time, so you know Nick was still in his prime.
The problem with NPC vampires is that they try to live their lives like normal sims. "Oh, what a beautiful day! I think I'll go on a picnic at the park. Do you smell something burning?" No survival instinct to speak of.
Speaking of that particular sim, she no longer has the bite marks on her neck (despite the fact that Nick bit her on the wrist, the marks were on her neck). Do they disappear after a while, or did a glitch cause them to go away? She's still all vampy and everything, but the marks are gone.