The word a lot is defined by a large quantity, not everything (or all). As someone who's been writing on self improvement since 2015 I've personally been through a lot and share my overall experiences and thoughts on what's going on in the industry.
I'm fully aware that people take up the mantle of self-improvement to do some genuinely helpful things as that was my intentions ever since writing in this industry. However, a lot of people use it for their own self gain as Shannon has been pointing out.
I personally think that this industry that's designed to help people can do better in helping people.