Mortals fear them, And rightly so, They feed on them, And fear turns to contempt. Its not a surprise that they are hunted down and destroyed.
That's if they are ever hunted down or easily detected. If I recall correctly, only the feral vampires are often hunted and slaughtered. Seridur wasn't hunted because no one knew he was a vampire, which is why he made a vampire hunting order to kill other vampires. Clearly, the vampires he wanted dead where savage and barbaric, the same ones Count Hassildor hates. Wouldn't make sense to kill your own clan mate unless there was a good reason. What he did was further his own agendas, he manipulated the vampire hunters and remained secret about his nature. Although he screwed up when he fed on Rolfina(Roland's lover) at night and did nothing to Roland after he caught him red handed. He thought if he blamed the murder on Roland, it would be fine, but it didnt work that way, now did it? I guess his machination worked in some sense, Roland did not even bother telling anyone because "Seridur is a respected member of the community, they would never believe he is a vampire", which ties into the tenets:
"And manipulate the hand of society to mete out our agendas."
"We live amidst mankind, and twist them to our will from offices of power."
"Second, devote your pursuits to the procurement of influence, political and otherwise. Our strength is not in physical numbers, but in skillful manipulation of society."
We can also note Jakben Earl of Imbel, was also a respected member, although being a reclusive man, he was known for being a "good" fellow, although snobby. "The Courier is shocked to learn that Earl Jakben, a local noble
of previously unblemished reputation, is revealed to have one of these vampires!"
And we have the unnamed vampire in Immortal Blood, who feeds inside a chapel(Daggerfall vampires were hurt when walking inside holy places). The Vampire Hunter was on a unquenchable quest for understanding and how to kill the varieties of vampires in Tamriel, but in the end, he was killed by the very man he sought information. And by how the book states, the frustrated vampire hunter(Distraught because he couldn't "find" a single Cyrodiilic vampire) was killed when he was awake....while it does not say that, the vampire caught him by surprise...he was not asleep. And by Seridu's line in Memorial Cave "Enough monologuing, time to feed!" proves that they dont need to feed on sleeping victims, but merely chose so to remain discreet and not bulk up a kill count.
What got me confused was this:
"Do not feed where you may be found out, or on those who may not suspect your passing. Avoid daylight by lifestyle; dispel common belief in our kind"
They do walk in daylight when fed, we all know that from gameplay elements and here in the book. But do not feed on those who may not suspect their passing? Or dispel common belief in our kind? Hmm..what kind of beliefs are those?
That's better than what I had in my head. Working off of that, we have the leadership who contacts one of these cells through an intermediary the cells operate as a group/coven/meeting group working as a group to work towards their given goal then at the bottom of the organizational (but maybe not hierarchical) totem pole are free agents attached to the cell who for whatever reason don't work with the larger group and are likely the people who regulars most interact with... this is starting to sound a little like the Dark Brotherhood and their Speakers.
Yeah, that works much better. I had the leadership cell and then they managed independent cells or one-man free lancers, but that'd attract a lot of attention to wherever they're currently hiding out and anyone chasing them would easily be able to put 2 and 2 together.
Finally remember that they don't rule the empire and they don't want to. The order likely exists as a means of protecting their bloodline from inter-vampire politics or of keeping them hidden from the public. Now that may include having an agent on the Elder Council, but no matter how superior they think they are, these vampire's patron is Clavicus Vile, not Dagon, Prince of Ambition.
Their patron is also Molag Bal, Prince of domination and enslavement and strife. It makes sense they don't want to rule the Empire, I thinks it's a good idea that they let the humans fo the ruling. Otherwise there would be civil wars and power games, political struggle for the greater power. Better to manipulate, feed, remain healthy, live in peace. I still can't believe there was a vampire dumb enough to reveal his secret to an Orc woman...yes, i'm talking about Lovidicus.