It's probably a sad thing that my first reaction to this theoretical ecology of vampires is neither "who cares", nor "wow, that's cool", but "wait, I think there's an error in that first expression".
There is that; I suspect the formula is rather less good for near-zero H. My main objection to it is that that the '-aHV' term in that first expression shouldn't be in the denominator, but after the fraction term altogether - I suspect it might be a formatting error.
Hmm... I think Sunnydale is established as having something like 30 000 inhabitants. (Wikipedia Pete told me so once. 38 500, when I went back to check.)
Have you read Peter Watts' novel Blindsight? Interesting hard SF take on vampires. mysterysquid owns a copy, or it's available for free on the web here.
It's not primarily about vampires - it's a very good "first contact with with higher alien life" novel - but the mission leader was specifically chosen to be a vampire, and the background on how this works on a scientific and evolutionary level is sprinkled through the novel.
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