I agree there is the ideology aspect.

Additionally, individuals are earning a living through promoting this ideology. This includes:
- authoring books (several links provided in earlier posts upthread),
- speaker fees (for example, the link here).
- While this statement from 2013 mentions that she will donate most of her speaking fees to Network for Public Education, she co-founded this as a 510(c)(3); Donating monies here may serve as a tax shelter. NPE also seeks donations. The "What We Do" page of the NPE website indicates that the work products are Press Releases - Newsletters - Reports - and an attempt to build a Grassroots Education Network.