The article actually had some fairly intelligent replies from some senior members of that message board.
Do I think they're vampires? Nah, probably not. I don't think vampires exist at all.
I do, however, think that some of those people might actually have a condition (different depending on the individual, yet similar.) that is either physical or mental in nature. Whether it's minor or major.
That board provides a place for people with similar ailments can socialize and communicate. Nothing wrong with that. Maybe they're all out of their minds, maybe they aren't. I really don't know.
What I do know is that, despite possible insecurities, they're probably better off than people who have more serious vices. Smokers, alcoholics, drug users...
Of course, some of those people are completely bonkers and need help, but a fair number of them seem to be fairly decent individuals. It doesn't hurt me if someone decides they need to drink blood to survive, or to be well.
I mean, they really aren't much different than us. We here at The Escapist are all gamers. I'm sure a lot of us consider games to be a necessity in our lives, much in the way that the "vampires" believe they must drink blood. They've found a community so they can socialize amongst one-another, just as we have. The difference is that they cling to something mythical, or a mere idea.
tl;dr: Some of them are fucking retarded and need help, but there are others who are perfectly reasonable people.