That is the flaw of a fantasy theory.
Vampires, like other humans, reincarnate.
However they do not do so differently at all.
Vampirism is a condition of the body,
not the soul nor the spirit.
It is a curse,
not a blessing,
because there are no definite benefits to being a vampire.
Vampires are not superhuman,
not super intelligent(at least not because of being a vampire),
and they are nothing more then your average human
except that they must feed off the energy of others.
I have actually found that plants,
specifically the California Redwoods,
can have a similar occurrence.
An albino Redwood,
unable to get nutrients required from sunlight,
will sap those nutrients from the surrounding 'normal' Redwoods.
However, an albino Redwood is still a Redwood.