First things first; Black Holes are regions in space where gravity is so great that nothing can escape it's pull within a given distance. Let's start at the beginning; What's gravity?-The attraction of one bit of matter for another. So, the more matter in one place, the stronger the gravitational force. Hence: A Black Hole is not some funnel whizzing around, sucking up matter and destroying it. But, the question lies in the theory of wether the vacumed matter is being pulled in and used to create that much more gravitational force, or is it being extracted out the other side(Quasar)? How does the photons of light benefit a black hole if there is no mass value to it(light)? Maybe the quasar only emits the energy of the light that it can't use to become greater in mass. What do you think?