What must be remembered is that Angels, demons, natural, and lower spirits are all rather primal in nature to one extent or another. The hierarchies that are used to describe them, and the rules to traditional, ceremonial conjuration and similar practices are there because, of old, these were viewed as formalities that not only established a link with the spirit, and control over it, but were, of old, a measure of displaying respect.
To modern sensibilities, binding any spirit to servitude would seem rude, if not outright nasty. However, it must be considered that of old it was an honor to serve one who was "greater" than you, or to even serve alongside a peer. Thus do many old rituals establish the taking of oaths from demons, and binding them into servitude; the calling of angels in the name of god to educate you as, if not their peer, than the favored children of God, Man; and various incarnations of rituals intended to bind nature spirits to one's will.
This sort of binding, oath taking, etc. is not necessarily disrespectful, rude, or nasty, but if performed properly is a display of respect. It shows, in the order of things, that you are the "alpha" so to speak, and that your knowledge, wisdom and Will is worth serving. Make no mistake, if efforts are not made, you are weak of will, and your understanding of such things is faulty, these entities are generally free to do as they wish - thus the cautions that are told in legends and lore. But, in general terms, it an effort that is little more than showing yourself to be the alpha in a pack of animals - the one who leads, the one who is worth serving.
And being such involves picking up the mantle of assorted other responsibilities as well. So yes, you could certainly take up the control of a host of spirits. But it could potentially be burdensome at that.