One thing that didn't make a lot of sense....

Math frowns on the likelihood.

Aubrey says a kill must be made every five days. Killing and draining 5 pints of blood from a victim (conservative, an adult human carries twice this amount) every 5 days adds up to a healthy vampire diet of 1 pint per day.

The Red Cross collects blood by the pint. They claim a donor will replenish the pint in 1 week for plasma / 6 weeks for red blood cells. So one pint of blood costs a donor 6 weeks of time, or 42 days, if sustainability is a key goal, and it is.

So a vampire would need 42 donors to get 42 pints of blood every six weeks on a rotation of donors assuming their aren't any other issues like death, police shootings, scurvy, or resignations. In other words, a vampire needs a small army of groupies to pull off a kill-free diet.

Management of such a group may prove difficult in a clandestine operation.

Managing the emotional state of a groupie army: Do the groupies get jealous? Is it best to separate them? How many groupies will reliably believe they're the heir vampire? Will they kill each other?

Finding reliable groupies: Groupies typically want to be a vampire. They're scum of the earth. It's a big coffee stain on any resume.

Etiquette: 420 friendly, vegan, and omnivorous are taste preferences. Garlic is not. Does etiquette permit a vampire to avoid Italians because of dietary concerns?

Larger groups and Orgy dens: Assuming the groupies aren't territorial, an orgy den may be a possibility. Unfortunately, larger groups gain more attention. Will the neighbors complain? Will the fire marshall get all up in the vampire's *beep* and start being an *beep*

In the end, a kill free diet is a lifestyle choice. It requires commitment but can be very worthwhile and lead to a more active, fulfilling vampire life. If made to take the high road in the moral dilemma of vampirism, care must be taken to treat the vampire blood slaves with compassion.