I have read much of the book. It really leaves the reader feeling that Martin was not a honorable person when it came to treating other people in his employ with respect and honor.
How many comics publishers could be considered honorable? There are quite a few stories about the weasels who ran comics, but very few about good guys who ran comics.
Though I haven't read in-depth about Bill Gaines' EC comics publishing empire, I've gotten the impression that, compared to most comics publishers, he was fairly benign in a paternalistic way. True, he didn't want to cede 51% control of
Mad Magazine to Harvey Kurtzman, and I suspect (but do not know for sure) that EC writers and artists never got royalties for the various reprints of their work in Ballantine paperbacks,
Mad anthologies, or the Russ Cochran EC reprints.
OTOH, he certainly seemed to display a certain loyalty to long-time Mad Magazine artists, and apparently paid them well enough for them to have
MAD as their main venue for decades. (I'm thinking of Dave Berg, George Woodbridge, Mort Drucker, and other middling stalwarts.) I know that Don Martin had his beefs with Gaines' use of his work, so I could be off-base with my impressions.