I don't know why any Vampires would want to do that to their teeth, I think it makes them look like they're trying a bit too hard. But he must like them, and they're more subtle than some I've seen.

Putting his teeth aside I think he talked a lot of sense and I am grateful to Terro for the link.

For me, as a Vampire I do not believe we have anything leaking that makes us Vampiric. I would know if my Aura or any of my Chakras had a hole in them and were leaking energy, and they're not.
It is obvious that the energy deficiency is very acute, and has some semi-serious side effects which can become very serious for some of us. But wondering where it comes from is like wondering where the hunger comes from for Weres, and where the empathy comes from for many of us.
I think that the reasons for the way we are are something else that each of us may have a theory about, but no-one will ever have an answer that we can all agree on, and that in the middle of what we all think, the truth lies somewhere, but none of us will ever really know where.
To me a Vampire is a human body with a vampire essence, and that Vampire essence needs more energy than it can produce for itself, so it has to take in energy from outside itself, it has no choice. But it can choose where to take it from and how it takes it.
As Terro said to take energy from anyone by force is an unacceptable thing to do, and is frowned upon by many in the Vampire community.
If Psi feeding from non-kin is what you do and you have no donor, then the free energy they give off is perfectly adequate to sustain you without having to feed without permission. Even better for you is the energy from nature as you don't have to worry about it having been contaminated with feelings that might just pass to you along with any of the energy you absorb.
As Zilchy said blood drinking is now also considered unwise by many of the Vampire community. It gets more and more risky every year. But if you really have to find your energy that way then for Goddess sake be safe about it.
A Vampire might also have a skin sensitivity to sunlight, and an eye sensitivity to bright light of every kind. A delicate stomach that has problems with unusual/over flavoured food or even just an inability to eat 'meals', having to snack on small amounts throughout the day in order for the stomach not to get over full. Cravings for unusual substances are not unknown, perhaps for some they are looking for a blood substitute, and for others something that 'feels' right and satisfies their need to take in something to fill the void they have that nothing seems to fill.
Fangs I believe are a misrepresentation, since there is no reason for them, and no-one I have ever met has any memories, or has seen any clan writings/history or knowledge of any kind that says we ever even
had them. Except of course the movies love them.
The truth is that biting someone is NOT a good way to get blood from them. It mangles the arteries and veins and makes blood go everywhere, even with the sharpest teeth you never get an even puncture or a straight cut. This would make feeding difficult, time consuming, and messy, three things you don't want if you are trying to feed in secret.
To be an ageless Vampire is a physical impossibility, as the human bodies we all have to inhabit age just like all Otherkin human bodies age, and just like the non-kin bodies age. Vampires
may age slower than others, but there is no proof of that, and if it is true it isn't true for all of us anyway so.. Ageless Vampires? Hmmm Universal Studios anyone??