A well fed psychic vampire is a happy psychic vampire; and can be beneficial to the entire community. So often we forget to feed or feed unintentionally, that we dont even realize it, this can manifest itself in creating negative scenarios, creating drama, and all around giving yourself a bad reputation in the community. This is not to say vampires that feed on negative energy are bad, but there are ways like cycling energy to take someones negative energy and cycle back positive. which is one of the reasons there are many psychic vampires in the medical field.
The Black Veil
Leaky Bucket Story
Good shielding techniques are some of the essentials you should first learn.