The last thing a vendor wants is other modellers to know how to make things, because then they lose their ability to sell things. 

I believe that this is the main reason that there are no complete tutorials on content creation.  All the tutorials I've bought leave out some vital section with promises of "It's coming soon!"  They seem to feel that figuring this stuff out on one's own is a rite of passage.

There seems to be a large chasm between being a Poser modeller, and being a professional modeller in other genres of 3d.  Unlike other modelling communities, the Poser world is a community where modelling is still a big, scary, dark black magic, and only a handful of people truly know how to do it, and sell their creations.  Poser modellers are very protective of their craft, because they make money directly from their output.  In other words, you only make money when you model for Poser by selling your products directly to an end consumer, and there's little money to be made by selling the knowledge or skills.  90% of Poser users don't want to learn how to model.  This isn't the case in most other professional 3d genres, where modelling is considered part of the entire procedure, and you can make money in other ways if you know how to model.  So knowledge of the craft is more openly shared, and exchanged freely.  In the architectural communities, or game creation, or even 3d printing now, knowing how to model is only a part of the overall picture.  It doesn't matter if someone else can model the same thing.  It's the creativity, speed, and other factors that matters, and makes you the money, and lands you the job.  In other communities, everyone knows how to model at least a little bit.  Even people who specialize in texturing or sculpting, or whatever... know a little bit of modelling, or care to know, and the commodity of the knowledge isn't as valuable.  In the Poser community, no one cares to really know how to model, except a handful of people.  Everyone else are just consumers.  So the commodity of knowledge there is much more valuable.

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Tools :  3dsmax 2015, Daz Studio 4.6, PoserPro 2012, Blender v2.74

System: Pentium QuadCore i7, under Win 8, GeForce GTX 780 / 2GB GPU.