I guess I should have written this with the link. Most people that create full languages are different from those that create naming languages. I belong to the first group with the absolutely nerdy (VERY nerdy) love of how languages work and enjoy the act of creating one. Seasoned language creators tend to create a culture to understand the language they are creating and therefore do as you said, create their own saying based on that culture (the author of the posted site created a rich culture to go with his language, maps, drawing diagrams, etc.).
This group tends to worship Tolkien because he was the most well known person to love languages, love creating them and (and I think first) wrote his books to showcase his creations. I, personally, respect his work but do not adore him the way others do.
The Vulcan language effort (
http://www.stogeek.com/wiki/Category:Vu ... _Institute) is under this category as well.
Then there are those that create a language for the sole purpose to enhance a story. Klingon before Marc Okrand got his hands on it is an example of this.