From blog sales there is a broad range of price acceptance for audio up to about 25 dollars. Obviously more sell when Amazon marks audio down to 1.99 or 2.99, etc (they control prices for indie audio unlike with books where the author decides on price). They also only offer a flat 50 cents to 4 percent for associates for audio so there are not a lot of sites vetting audio or even mentioning it when it's available.
And yes, I've heard the voice actor makes a big difference. The good ones are a lot more expensive to hire, of course. Because it can be so difficult to earn back the expenses, there are not tons of indies rushing into that market. The Big 6 don't rush in either. Sales have to be doing very well with a book before they will consider an audio expense.
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