I actually do, well its bit of a phychological disorder as well meaning a person does not mearly choose to drink blood but can not stop them selves. In most cases it's and iron diffecency that has caused someone to crave blood simply because it is rich in iron.
I might equate that to other eating disorders or alcoholism. Very real diseases that I don not believe are entirely psychological. For instance, people who eat food that has little to no nutritional value are often obese and gorge themselves.
Do you live an "non-average" lifestyle to facilitate satiation, or do you "go hungry" keeping it a secret? The third alternative could be drinking your own blood of course.
And harvesting organs from homeless people will never happen, ethic scientists wont allow it.
Check this link about a movie on that subject. It's worth renting.




