What Would a Society Run by Vampires Look Like?

At the end of Blindsight by Peter Watts (earlier comments here and a summary of vampire biology here), it looks like the solar system has been taken over by vampires. I've been trying to figure out what a vampire-dominated society would look like.

Let's see … Each vampire (or vampire family) would have a herd of humans to provide blood and possibly be servants as well. They would be well armed and insist that that their herds be defenseless (unless they bred some of their pet humans to be guard dogs). They would have well-marked territories to minimize conflict (highly dangerous in predatory species). Under normal circumstances, a vampire would get a territory by inheriting it. Since vampires might be loyal to close relatives, they might have elaborate kin exchange customs to minimize conflicts. In other words, they would act just like royalty did in the age of absolute monarchies. There are even legends of undead kings …

This would explain why the oldest civilizations were frequently absolute monarchies. I recently celebrated a holiday commemorating the escape from such a regime. Were the first few Pharaohs vampires? (There are other speculations for the monarchies of the period.) It would even explain the long life spans of the pre-Abraham patriarchs in Genesis.