When one is first being contacted by one's HGA, the angel often takes the form of a police officer in dreams. The reason for this is that in our culture, the police officer is a sign of absolute authority. We may dispute the rightness of our politicians but rarely, even with evidence of abuse of power*, is a police officer's authority questioned by the general public. We know police officers at a subconscious level as an authority but also by a different name, peace officer. It is through these dual ideas that the angel takes it form, unquestioned authority and a keeper of peace.
Long after these appearances, he may take another form such as a corporate CEO. In this mode, we acquiesce to his authority because of what he can bestow upon us. In this capitalist society, that is a job or an investment opportunity. Of course, the arrangement is strictly voluntary. One can, at least in theory, work for anyone and invest anywhere. That said, the choosen relationship is entered into with by both parties with an eye toward profit. So it is at this stage with the HGA. The human spirit gains something. There is also a gain on the part of the angel. What that is, I cannot say.
* This is not meant as a condemnation of police officers merely the acknowledgement that some abuse their power. Nor, should one's political view of police enter one's thoughts when considering these ideas. We are speaking in long-term cultural ideas only.