Hard disagree. I have read lots of books, participated in events and training seminars and had profound results in my life. My marriage is better because of what I learned, I am a better father and leader because of what I learned. And the fact that people sell things as part of that growth journey is how they support their ability to share the lessons and techniques.
Can you share an easy-to-understand example for someone who is similarly highly sceptical of self-help products?
Well grifters can also be marks. It sounds like you're both.
"because of what I learned." Do these books/seminars actually teach you something new about being married or a father, that you didn't know before? Like what? I always figured they were more about coaching, persuasion, convincing. To the extent I've scanned them, I never saw any kind of new fact, definitely not about something like being married.