To Lanir: It's not intentional. The PC playing the BCV is my spouse and has been our GM for most games we've played in the past ten years plus. She's probably the most respected GM and roleplayer in our area. She was just kinda mixed up on how the BCVs turned people. Given the explanations in this thread, she was coming around to understanding that if a BCV just feeds on someone, they're fine. If they're fed upon unto death, they'd become a vampire, but only with an investment of blood from their sire would they become a FULL-FLEDGED BCV.
That said, the way she was turned gets a little sketchy, but I took care of that. She was fed upon to death because the BCV in question was preparing some minions for the big plot he's involved in in the city right now (my other thread here, we're working out all the details) and when the PC that came along to "save" her set the BCV on fire, well he donated blood to her by happenstance. So she's able to be a real BCV, but she's young, fledgeling with no one to show her the ropes of their more key powers. She has inhuman strengths and recovery and whatnot, but she doesn't have and may never have dominates and animal forms and mist forms because she'd need someone to teach her how to do those things... and well, she's fighting her nature so...
Anyway, I think the question has been answered now! 1-2/week for the bare necessities. More than that for enjoyment. And of course, as per feeding dependency, as needed.
This gives me a good idea of how much to bother her about her need to feed.