I never did state you had a lack of control. I don't know you. This is actually less about you and more to do with the humans you're planning on drumming up.
Some vampires need blood to survive, so there isn't an option. Others don't. From what I've seen and heard here, vampire's opinions toward blood differ.
My concerns are that drinking directly cannot replicate the conditions under which it is safe to donate blood. The exact amounts taken, the frequency, the aseptic techniques. I can hope you'd take age, physical and mental health into consideration. It's about the health of the invidiual.