This parasitic ability is found in nearly all of the psychopath’s actions. From the one-sided relationship with benefits to the power dynamics exerted in business, the psychopath at all times looks for ways to receive more than they give. Neurotypicals think of symbiotic relationships and exchanges of power where each party gives reciprocally to that which they receive. This is unheard of for the psychopath unless there is a benefit to be had in the grand scheme of things.
No, the host may not be concerned with the health of its nuisance. That said, it is not personal when a leech attaches itself to its host. It seeks its nutrients in anyway possible and it has evolved to take it by force. The psychopath is merely a parasitic savant, choosing targets to bleed dry in order for its own survival. He knows no other way. The psychopath’s bloodsucking ways have no benefit to those they choose to feed on. Ultimately, the host must remove its own parasite. Otherwise, they will be bled dry before the leech moves onto its next target.