Audio has been around since, I suppose, the spoken language. The difference now is distribution and availability. Audiobooks, podcasts, smart phones, voice controlled home speaker systems, connected cars, and who knows what will come next.
Finally, we can create ads for audiobooks! Here's the news. Here's a walkthrough of how to actually create an ad in BookBub.
My only concern with using dictation is how my mind, and how my imagination, will adjust to it.
Don't know where to price your audiobooks? Here you go.