Love this concrete interpretation. The symbolic one is maybe more interesting:

Vampires:

- Consume the life force of the living to sustain themselves

- Are totally isolated and perverted from any kind of human community

- Have no family, no community ties

- Unable to feel love, warmth, connection with any human

- Must avoid spending time in the virtuous natural world (daylight, sunlight) and must instead be cordoned off indoors or in darkness, they do not live as most natural things do.

- Are kind of fallen/perverted; at one point, they were human, but they failed at being human (for instance: unbaptized, excommunicated, murderous, etc) and so were forced into exile often due to their own choice to live sinfully

Billionaires:

- cannot become a billionaire without thousands/millions of regular non-billionaires siphoning money (== time, == life force) upwards

- when they become a billionaire they are forced to be distanced from their community/family of normal people; middle class people are never "regular friends" with billionaires

- either their normal family/friends are 'bitten/infected' (wealth inheritance) or cut-off

- often are profoundly isolated on a personal level (are they talking to me for my money or for me?)

- often the direct cause of or at least complicit in the destruction of the natural world (i.e. cut off from sunlight; unnatural)

- often must make unethical or immoral choices to catapult themselves to wealth/powers (fallen, sinful)