I think there should be a sort of academic-esque literature (in the sense of journals and critique) that analyzes these things.
Also it requires a lot of conscious effort to change the patterns that make up yourself. The first step is to learn that skill. It seems like that is where everyone mostly fails.
Ironically, I could write a self-help book/blog using these observations and present myself as an authority, but I realize these are just my opinions.
Combine this with people liking new things and I think it explains a significant part of the self-help book industry. And why do people write them? Money, but also the same reason we write comments here. It somehow feels good to share your opinion, regardless whether you say you're an authority or are just sharing an opinion you're not completely sure of.