Not all Vampire Hybrids are a part of the Valerius Supreme House.
But every powerful Vampire Hybrid is certainly a part of the Valerius Supreme House.
Even though those who have the bloodline of a Vampire are considered to be a higher citizen, the chosen one, not everyone was fortunate. The Valerius Supreme House could only host so many Hybrids; there is only a limited number of spots.
And those who aren't a part of the supreme house have a hard time.
Upon awakening, Vampire Hybrids developed a thirst for blood.
It wasn't once in a while either; the thirst visited them frequently.
Finding blood without harming others is hard.
Money is the main problem, as the only way to access blood legally is through a Blood Bank.