I don't think it's possible to quantify "all the benefits" of anything, particularly something as personal and esoteric as AP/OBE.

But the bottom line is that what you gain is experience, and experience leads to wisdom/knowledge and, for many people, various forms of growth. Experience is the only reason we're here, as far as I can see. I don't know if the wisdom/knowledge ends up meaning anything or if it's just a by-product. Same with growth. But every single being that has ever lived, however briefly, or will ever live, has one thing in common: experience. Not the same experiences, but still, the essence of life is experience.

AP/OBE opens the door to all kinds of different and unusual experiences. In my opinion, that's the biggest benefit, right there.