Says Karma.

Anyhow, just a little thought: Wouldn't it be possible to implement the vamps food favorite, O+ as a trait that could be given through awesome?

Such as that, all vampires who feed off of this sim would get the "sanguine snack" moodlet, disregarding the "hunt" option. It would be nothing short of someone actually having superior blood - full time.
Though playing the predator is quite nifty; I favour the thought some sims simply TASTING better. Much like how mosquitoes suck me dry in our horribly humid summer afternoons.
Though I really could do without the latter.

Props to most of the suggestions popping up here! Presuming The Boss might, or might not integrate it into awesome, I can't wait for the results.