Earlier quoted context omitted.
I almost became an author (of a video series) for them. I signed a contract and produced a couple of chapters. I found they had pretty reasonable copy editors, at least the one I worked with was helpful and thorough. My main problem, and the reason I didn't finish the series was their advance was very low and the royalty rate was too. After looking round it seemed the rate was probably reasonable for authors in other…
I wrote a book for Packt and made less than $1000 from it, two years later. However, it is something to put on your resume (if you want to) and I managed to use it to leverage a book deal for a more reputable publisher later on. So it can be useful if you think you might want to write books in the future. However, yeah, the money isn't going to be worth your time by a long shot.
I actually learned a lot through doing the video, and the guidance I got was pretty good over the technical aspects of putting a video together. The later script editing and review stage was dismal, though. I got the feeling the less experienced editors I worked with later were overworked.