There are definitely some that do, some that won't. I don't buy any unless I've read them already (library/libby) and felt that it really resonated with me. Don't feel pressured to read a self help book cover to cover, take what you need from it and skim over what you don't.

My favorite personal development books have been recommended to me by therapists i've had throughout the years. They know I like to read and suggest new ones to me based on what comes up in a session. For example, I went through a phase of reading desmond tutu's book on forgiveness and a lot of brene brown when I was going through a rough patch. Books on attachment theory when i was struggling with relationships. Man's search for meaning when I was having an existential crisis. All of the above books were very good, but especially for what I was needing at the time.