The occult elitists and churches don't want the "common man" to know that he can go out and buy an inexpensive grimoire, of a system that may or may not work for him, and possibly attain spiritual enlightenment on his own. I say, if it is your path, take the book and go out and become that hedge wizard, swamp witch, nomad mystic, etc. As with all things involving faith, and that includes Christianity, no system will work for one that does not believe, and have faith, in it.
I've been seeing people talking about Orion and how they are/were confused when it was revieled that the constellation they should have been looking for was the big dipper. Anyone who cares to do the research on ancient, and modern, Middle Eastern and Asian references, considering the geographical regions the Necronomicon is said to hail from, to the great bear will find, rather easily, that it refers to a grouping of stars of which the "handle" of the big dipper makes up the "tail". For those who didn't know this small, easily found, bit of information, chalk it up to geographical and cultural differences. If it is, or was, working for you, don't give up, just redirect your rituals. After all, a motor running when it's out of tune doesn't get thrown away, it gets retuned so that it runs much better.
This book clarifies what is in the Necronomicon. It puts into plain language what is required and what needs to be done to carry out the ceremonies of self initiation within. It also warns that the spirits one may summon, Zonei or Azonei, will not be forgiving if improperly summoned. That small piece of knowledge is a constant through many systems of magic wether one is calling on ancestor spirits, demons, devils, angels, gods, elementals, etc. But it is a warning that can't be given enough and should allways be kept in mind.