Quote:Why would he try to make the text look like a language if the "clients" could barely read their own?
Because some of them could read anyway. In towns in Germany around the year 1400 it could be 20%-30% of men. That's what Gemini says

And having a manuscript in unreadable language our charlatan could tell any crazy stories he liked.
By the way, it's time for the question - what Voynich Manuscript is about.
So if the text is meaningless, then it is about nothing, right?
But it seems to pretend that it is about medicine, especially women medicine.
Think about some common thing in all parts of Voynich Manuscripts - herbs, pharmacological containers, astronomical diagrams, bathing. It is all related to health.
Of course you must remember that medieval medicine was connected to astronomy and astrology. You should collect plants only at certain day, make surgeries only with some setup of planets and so on.
And there is nothing in Voynich Manuscript obviously not related to human health like a bestiary, religious stuff or some knight stories.
Speaking of women health manuals, such things existed. For example there was
Secreta Mulierum by Albertus Magnus:
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Secreta Mulierum is mostly about pregnancy and Voynich, judging by imagery, seems to be also about pregnancy.
Have a look at chapers of Secreta Mulierum:
[*]
Code:
[*]On the Generation of the Embryo
[*]On the Formation of the Fetus
[*]Concerning the Influence of the Planets
[*]On the Generation of Imperfect Animals
[*]On the Exit of the Fetus From the Uterus
[*]Concerning Monsters in Nature
[*]On the Signs of Conception
[*]On the Signs of Whether a Male or Female Is In the Uterus
[*]On the Signs of Corruption of Virginity
[*]On the Signs of Chastity
[*]Concerning a Defect of the Womb
[*]Concerning Impediments to Conception
[*]On the Generation of the Sperm
You must remember that pregnancy in medieval ages was a dangerous thing. A lot of women died during childbirth and conventional doctors were often helpless. No matter if you were a princess or a cowgirl the risk was mostly the same.
If our charlatan promised in convincing way a safe pregnancy and childbirth and you needed just to buy his wares then he could enjoy popularity.