I think that everything you do helps you to write if you're a writer. Adversity and success both contribute largely to making you what you are. If you don't experience either one of those, you're being deprived of something.
What scares me is what scares you. We're all afraid of the same things. That's why horror is such a powerful genre. All you have to do is ask yourself what frightens you and you'll know what frightens me.