This would be an encyclopedia kind of thing, there could be people out there who are proffesional journalists or university profs who can deliver the necessary quality of writing.
Two points. Many of the authors of ST factual publications started out as amateur writers. Geoffrey Mandel, a chief contributor to "Star Trek Maps" and author of the more recent "Star Trek Star Charts", started out as a
fanzine contributor (to semi-pro fan publications like "USS Officer's Manual" and the original fan version of the "Starfleet Medical Reference Manual"). Sondra Marshak, Bjo Trimble, Dorothy Jones Heydt, Jacqueline Lichtenberg, Jeff Ayers, the Okudas, Larry Nemecek, Allan Asherman, Paula Block, Margaret Clark, just to name a few - and many of the RPG authors and illustrators - all of these people
started out as fans, gained a professional reputation in fannish circles first, made successful pitches to professional publishers - and became pro authors.
It's not a lack of willing writers that is stopping Pocket/Gallery from publishing ST fact books, or stopping CBS from offering free ST facts online. And it's not that ST fans can't or won't work for free, or can't write to a professional standard.
The marketplace has changed, at least for ST. Bookshops told Pocket they just weren't interested in trying to sell big, beautiful stuff like "Star Trek: Action!" and the critically-acclaimed "DS9 Companion" because they took up lots of room on bookshelves and weren't moving fast enough to warrant reordering. I recall Marco once saying how the first printing of the DS9 Companion was still available from the warehouses
many years after it first came out because, despite it being a wonderful book, there just wasn't the same number of people wanting to own that work as already owned the TOS and TNG versions.
SW allows amateurs to make contributions to canon and it worked for them.
Well, under the accepted rules of "What is ST canon?", no ST "facts" become "canon" until they've appeared onscreen in a live-action production produced by CBS or Paramount. Even in the SW universe, a fact in a SW publication can be swiftly overruled by a filmed Lucasfilm Production.
What "worked for them" with SW - and still does - is that the SW fanbase has a wider demographic that includes
lots of little kids needing Christmas and birthday gifts - and there are lots of young people with disposable incomes who love SW. ST seems to appeal to an older and smaller group, many of whom now have different responsibilities on how they spend their extra money. Even then, SW publishers have made their missteps. As I said earlier, the publishing "flop" of Episode One - even though thousands and thousands of books were sold - sent UK publisher Dorling Kindersley to the wall. Its remants now survive as "DK", but it's a shadow of its previous juggernaut self.
Perhaps many ST "man caves" got turned into nurseries not long after TNG went off the air, 'cos it was about then the bottom fell out of the ST fact book market. And we saw the rise of
Memory Alpha and
Memory Beta.