What I know of Mommy blogging, or blogging in general as a money-making enterprise, reminds me of late-night infomercials on making money in real estate. There's no money in real estate as it's described, but there's sure a hell of a lot of money in speaker fees, materials, and conferences. Shovels and picks, as it were.
Specific to the topic in this article, gawd, does it reek of every sham work-from-home scheme I've ever heard, only "on the internet".