They have such a wealth of knowledge about the industry and most importnantly door openers for all major food giants in USA. They don't have a website, they communicate by e-mail distribution and if you are not brought to the group by the insider you will never find out about them.
If such a group is as exclusive and restrictive as you say, they're not going to give out their contact information to you to publish in a book for hundreds or thousands of brand new immigrants. Either the group isn't as exclusive and valuable as you claim, or you can't help at all in making that group available to a new immigrant.
I don't dispute that networking can be difficult, and that it's important. But a lot of new immigrants to the United States have hurdles far beyond simply not knowing what groups to get in contact with. Many have issues with language, and the general culture. A lot have an inaccurate understanding of how many employment-related matters work, with a linear notion of "if I do X, then Y
will happen". It doesn't work that way, and for you to suggest that purchasing your book and joining certain groups is necessary preys upon that thinking - and also does nothing to eliminate it, which is the real solution.
The other problem with your concept is that as you point out, the best groups are usually local. There are going to be thousands of them all across the country, and they simply won't fit into your book. Even if they do, the inescapable truth about specialization is that
99.99% of them will be useless or irrelevant to the average reader. The only thing that will differ from reader to reader is the 0.01%.
I think this affects family-based and DV immigrants the most, because they are admitted without any consideration of their ability to integrate into the US workforce and get a productive job. To be honest, I think the best solution might be to reduce the FB numbers (and eliminate DV altogether) but expand EB numbers and allow for broader self-sponsorship in that area.
I am also at a loss as to why you think that my spouse (or others' spouses) would be so in need of your dubious services. You see a fair number of women who are the primary beneficiaries of EB petitions, and there are even more that are educated, independent and quite capable of networking on their own without a book.
But I will throw out a question for you. I'm a recent immigrant in Atlanta, who specializes in Java development of parallel systems. What groups do I need to join in order to get a job? Do you have any groups that aren't already publicly available?