Vampires and the Bleeding System

[Haine]

My current thoughts regarding vampires:

• Humans have 500u of blood to start with. Obviously, something's gotta change in the transfer of blood to vampires, because you can't have vampires drain one dude to be at full power. I'm not entirely sure where to go here - have some bloodloss while draining someone, so you only get x units of blood for every y unit drained? Change the numbers for vampire powers entirely?
  
• I definitely want vampires to be able to drink from bloodbags. I'm thinking that since I'm going the "synthblood" route for bloodbags atm, they'll be worth way less than fresh blood, or just make the vamp gag and be really obvious or something.
  
• I like the idea of letting vampires heal bleeding/blood loss with their own blood pool, but more thoughts on this are always appreciated.
  
• With the blood system, I feel like vampires could get special powers or new effects from some of the changes in the game. More power from spilled blood around them? Special considerations in the system itself? I have a commented out clause in the bleeding code for checking if the person bleeding is a vampire, but I've yet to think of anything that could go there that I like.

As always, your thoughts and suggestions are way helpful here and really appreciated.