To shorten the time it takes to do research for a book, article, etc.
Ask people to help you with research in exchange for their name as a collaborator in the publication. You do the initial research and then share it privately with those who volunteered. They then go and do a deep dive into the subjects you found, reporting on their findings and possibly new ideas for further research. It’s much easier if you already have a name, but it might appeal to others even if you don’t, since most people will not write and publish their work. This gives them an opportunity for their work to be published.