"The mass is not about the congregation it is about Christ's sacrifice. That is why a priest for example can say the mass alone without any people besides himself and Christ."  

That's not correct. A priest is no longer supposed to say the mass alone, since Vatican II. The point of mass is that yes, it is a sacrifice, but it is one the whole church celebrates together. Jesus is present when two or three or two hundred or three hundred are together. In one sense it IS about the congregation. We are to find Jesus in one another and love God by loving our neighbor. We are to be in communion with one another. Communion is not "me and Jesus" but all of us together.