So I was playing on my Thalmor character (just going round sabotaging the Empire, hunting Talos worshippers etc), when I seemed to have contracted vampirism from a vampire NPC.
Now initially I thought I'd cure it straight away; no Thalmor wants to be impure. But then I thought of something.

What if, for an individual agent, it would be seen as a means to an end? They could operate faster, more efficiently and just generally cause more chaos. It would be similar to keeping Ulfric alive; a temporary cause.

What do you guys think? My idea could be bogus, seeing as my TES lore is on an entry level at the moment.

Sorry if it seems short, posting from my mobile.

No race, organization, etc will keep a vampire around. You can be a Thalmor supporting Vampire, just keep the "vampire" part secret from your confidants. As any Vampire should do.