Q. Krishna belongs to all so why limit His mercy to only the congregation members?
What is the advantage of having a congregation?
A. Krishna is not limited to the congregation. He belongs to everyone who love and surrender to Him. Therefore devotees go out and preach, distribute books and prasadam, organize Harinaam Sankirtan so that more and more people can become devotees and be part of the Krishna consciousness movement.
Congregation is important.
In the sense that when people see such a strong congregation with unity, and a spirit of co-operation they feel inspired to be a part of it and thus by coming in regular association with the devotees they gradually become part of the congregation.