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Great post. I listen to and pay for lots of audio content every month, none of it from Audible, despite appreciating that they sponsor many podcasts. Their pricepoints, Columbia House business model and creaky DRM turned me off long ago.
This is interesting when contrasted to the stink over iBooks Author as a composition tool, wherein you can give your output away for free - but only charge for it through Apple.
Both are heinous in their own way, but at least Apple seems to understand the power of free.