I know some of that is true--I have lots of notes on pentacles because everybody writes about the pentacles, and making new pentacles is a common and fun Feri practice. I have only a couple on the Black Heart because it's something we shy away from trying to define in words. I'm kinda happy there's not much about it on the web; it helps us identify the scammers when they show up.
I've got no articles or exercises labeled "DEMON WORK," but that doesn't mean I don't have any, just that it might be labeled differently. I might have "the rite of the dark spirit-lover" or several email discussions about self-transformation that belong in that category, and I just haven't sorted them out yet.
I also haven't moved outside of Definitely Absolutely Feri materials yet--so far, I've just sorted stuff I've gotten from/by various Feri teachers, used in their own classes. I know there's other stuff I want to include, but I decided to start with the Feri-specific stuff, and then add the "adapted to Feri" materials (like the Temporary Autonomous Zone, and some of Spare's works, and some of Chumbley's).