A nearly inescapable part of vampiric life is living among humans. Yes, it is possible to retreat to remote corners of the earth and avoid human society, but that can be difficult, hazardous, and difficult to sustain let alone sustain and advance research into Metamorphosis. So living among humans successfully is a challenge that we must solve.
The humans are ignorant to our existence, but exist in overwhelming numbers. We are superior in almost everyway, but vulnerable. They are prey, yet dangerous if awakened. To catch their attention is to invite annihilation. Their world offers abundant food but demands rent, utilities, and taxes. One can hardly work full time and expect to push back the frontiers of our science while doing so. One can live off the grid, as the Nosferatu do, and that option remains a viable choice for those able to manage it. We are, however, are not forced into it.
Those of us able to superficially pass for human can make use of the human world and its resources. With our disciplines and the blood bond we can acquire human slaves with which to deal with the human world. Wealth, daytime actions, a feeding herd, bodyguards, bank accounts, investments, proper identification, signing of documents and so on can all be accomplished by your slaves, allowing you to reap the benefits of the human world without distracting labor once the appropriate servants are acquired.
The human world is full of benefits once properly exploited. Skilled craftsmen for custom equipment, weapons, money, feeding vessels, space, and so forth. Thus the ideal arrangement is to extract maximum benefit from minimum engagement, leaving the vast majority of the student's activity for other activities. There is an already existing model for this kind of parasitic relationship: the psychopath. Not the dreary serial killer of human fears and fantasy, but the free rider who exploits human altruism and trust as well as the weak points in human society as well as doing high value stock trading.
It should be noted that the psychopath is a poor model for vampiric relations. The comparatively small local vampire population and the reciprical favor exchange economy means psychopathic behavior will quickly be identified and punished. It should further be noted that the psychopath is a poor overall model, particularly their poor impulse control. Nonetheless, they do exploit human weakness well. Surface charm, self interest, and emotional disengagement turn out to work quite well.
That being said there less conventional uses for humans. Sometimes the thirst is great. Sometimes we need slaves that will not be returning to human society. Sometimes we need subjects for experiments. Sometimes we need to make childer. In all these cases, humans are available and the psychopath continues to be useful as a model. The only issue is if you leave a trail that the police or other parties can lead back to your door. Use them as you see fit.