That's a good and interesting question. I think people who tend to be naturally empathic and caring are more likely to attract both types... since we're basically talking about a way of getting subconscious psychological needs met. I tend to attract these people because I am generally willing to be a good listener... and that makes me a good "dumping ground" for those with a lot of troubling things going on.
Personally, I am probably less attractive to "vampires" because they are more active and aware... and I am more willing to call people on their patterns. "Back holes" tend to be far less aware of their "doing" anything...
But that could be quite different from person to person.