Jesus, this thread got restarted? Just let it die, already. There are already forums devoted entirely to "vampires", go post there.
I disagree with the term "vampire". Simply because you don't fit the definition. If you're not undead, then you're not a vampire, sorry.
And I read the OP, saying that the term has "just stuck" and so you can't get rid of it. Newsflash: yes, you can. Choose a more accurate term - blood/energy feeder, "bloodist" like that woman at Vampiric Studies uses, or even sanguisuga, if you want to be fancy. Choose a term, and start using it - rather than just saying "oh, we can't do that, the community calls themselves vampires...blah blah". You too are part of the community, start changing stuff.
At least be accurate. I suspect that there has been little effort to change the term used because vampires are "cool" and it attracts followers.