I haven't ready any self-help books, and actually used to make fun of my Dad for doing so. Kudos to being candid about it; admitting you read Anthony Robbins on the Internet is almost like wearing a huge American flag T-shirt while traveling in the Middle East.
I'm still skeptical, and the whole stand-up comedian line of "if you've got enough motivation to read a self-help book, you don't need any help" etc. comes to mind, but for me it's like religion: if you're getting something good out of it, with no short or long-term negative side effects, can't be too awful a thing. I find most of my motivation through other people's ideas - music, movies, mixes, books, etc. - and that to me is more effective, but I sometimes find motivational speakers strangely persuasive. I *want* to be snarky (and am), but there's also a degree of "this may in fact be bullshit, but if it even gets me *thinking* about things in a different way, regardless of how huge Anthony Robbins' chin is, it could still be worth something"...