First, just to clarify, the complicated series of events needed to become eligible to finally purchase a Parsons that you described was a joke because everyone seems convinced its some sort of secret society. With that said, I would not agree that parson's keepers are secretive. Every parson's keeper I have ever known has always been happy to share their experiences and answer specific questions if they are asked, and many share photos of their animals, enclosures, etc., very openly. I would say, however, that in general those of us who work with or have worked with parson's all appreciate the importance of doing research, and realize the value in buying a book (or ten), utilizing the wealth of information that has been made available (if you search the forums, other websites, and published books and articles, there is a ton of information available) and educating yourself. The reality is that there is a lot of "information on the condition they live in, the size they grow to, the space requirements, the heat, the food, the natural plants they'd live around, etc", you just have to do some research. Anyone keeping parson's shouldn't need to be spoon fed this basic information, they should be able to do basic research on the animals they are caring for, and as a result, you don't tend to find step-by-step instructions and caresheets on every website and forum like you do for veiled chameleons and species that people commonly buy on a whim.
Chris