Well, it seems I finally got someone to read the book.
The books does address your concerns. Most of those 627 people will be of a volunteer nature. The TDG work should not interfere with the jobs, family life, and recreation. Many of the “middle layers” might have a small stipend to cover the extra time required to be of service to the community. But for sure, there won’t be a six-figure salary and an office of three or four staffers. Only at the higher levels will people be working fulltime on governance. What they got in compensation will be determined by the TDG. If they vote themselves a CEO salary, I’m pretty sure they won’t be elected for very long.
For sure, there will be more people involved in government than before. And I see this as a good thing because we already have an appalling lack of understanding for civics in western society. When more people actually participate in societal decision, that is when that understanding will happen.
In several places in the books, I have sections called “Anticipating the Critics”. I believe I have addressed all your concerns, mostly in those sections.