> Audible and Amazon are the same thing.

I'm acutely aware of this having worked there. They're the same thing to you, but not to most authors. Seeing their [audio]book come up in an Amazon search is distinctly different, even if it all leads you to the same place.

> iTunes: Can't everyone get his/her audiobook on iTunes?

No. At least not when I worked there. Audible was the only way to get into the audiobooks section of iTunes. That may have changed.