I don't know exactly what they do to the body of the "feeler". HATE/ENVY/JEALOUSY. How does the "feeler" benefit from any of it?

How does the "feeler" pay for it? Does it eventually tap him/her out and she is left broke and broken? Is there something of value that all can benefit from or is it  dark hole of infinite despair from which no one ever returned?

HATE
ENVY
JEALOUSY

Triple Crown? A Hat Trick? The holy trinity?