I mean, really, why would it be encrypted?

[VViews]

Well, this is obviously a speculative thread, but I'll throw in my own thoughts on this.
The illustrations don't seem to suggest content that was worth encrypting. So either they are not what they seem to be, or the text isn't a cipher. It would make no sense to go through all the trouble of coming up with a sophisticated cipher if the contents of the text is plainly illustrated on the same page.

Regarding the reasons for writing in cipher, in my opinion the motivations may have been akin to those given by Virgilius Maro for his scinderatio fonorum, (see my blogpost on the topic) :

1. "So that we establish the acuteness of perception of our students in searching and discovering these obscure things".
   
2. "Because of the ornamentation and construction of the speech". (later on he refers to this as "elegance") 
   
3. "So that mystical mysteries and those which should be apparent only to the knowing ones, would not be by chance easily found by the inferior and the stupid, so that, according to an ancient saying, the swine would not tread on precious stones". 
   

I think 2 should not be underestimated. The pleasure of crafting an elegant system, especially one that outsiders can't read. Maro has been described as "ingenious", "bizarre" and "insufferably pedantic" and I wouldn't be surprised if the creator(s) of the Voynich fit that description too.