My Answer: Baal HaSulam writes in the “Introduction to the Study of Ten Sefirot” (item 155) that Kabbalists obligated everybody to read these books, because when they are read, those who read them put themselves under the influence of their correcting force. This occurs even if the content and meaning of the books are not understood.
Therefore, Kabbalah books are meant for both those who want to embark on the path to reveal spirituality, and those who have already revealed the spiritual world. Those who want to advance use these books as a means of correction (Segula), and those who have already revealed the spiritual use them as a manual to guide them on their path.
The great majority of Kabbalists wrote their books not for beginners, but for those who’ve already attained spirituality. Only a few special souls (Baal HaSulam, Ramchal) exerted great efforts to write books that radiate a special Light specifically for those who aspire to attain spirituality.