The "Million Dollar" phrase is used to indicate that the authors have sold at least a million dollars worth of books, a marker intended to show the authors know what they're talking about. I read David Farland/Wolverton's Million Dollar Outlines (reviewed here) mistakenly thinking it indicated popular methods of writing (although that is Wolverton's purpose).
In Anderson and Moesta's modest book (about the length of a novella or so), they turn their gaze upon how one behaves as a writing professional. Some of it should be obvious: Bathe. Others we need reminders: Thank you's and unexpected generosity can win you fans. They supply examples. Also, I've thought of conventions as times to relax, but they show that for writers, it's the opposite.
And be nice. To everyone. It's something we've lost sight of, in this age of outrage. Anderson and Moesta do state that writers may choose to stick their necks out for different cases, which may earn you attention for one group, but the book's authors ask if that's worth alienating part of your readership. It doesn't discuss diplomacy and whether it can be executed effectively.
Although I've tried kindness and diplomacy since I've been in the field, the book lists things I still need to work on. I highly recommend this book of writerly etiquette -- comparable to Dale Carnegie's How to Win Friends and Influence People for the genre writer. Carnegie's book was so popular at one time that it became an object of scorn. If you read it, though, you'll find it packed with sound advice. Anderson and Moesta's Million Dollar Professionalism may fall into the same category.
Amazon had it on sale for $6.99, so snag this with several other volumes of writer advice at Story Bundle.