Venoms can be a problem. It still can transfer, and never mind that I've known several hunters who had done something similar to glamour their blood into being more appetizing, only to have the unfortunate side-effect of causing drowsiness, among other things.
It's a bit more of a complicated issue that I'm probably making it out to be. Groups deciding to go feral and let their baser instincts rule their lives, and others who like being a bit more cruel to their underlings, even moreso than some humans.
But I'm sure you wouldn't want to hear about vampire politics. It's admittedly a confusing mess on its best days.