I'd love it if voluntary payment could be mobilized to the point where it's more profitable to authors than the shit treatment they're getting from Amazon. For many, piracy is about rejecting the problematic distribution mechanism, not stinginess. It would be great to have a way to provably put our money where our mouths are (provably, because making Amazon look bad is part of the fun).
Edit: hah, only 15 minutes late with my attempt at Socratic spiel: https://news.ycombinator.com/item?id=48810056
If an author living at place X sells directly to a reader living at place Y and it is not true that for all governments G PlaceInJurisdictionOf(X,G) == PlaceInJurisdictionOf(Y,G), then the author is making a cross border sale which can have annoying tax considerations.
The internet made it very easy for someone to physically run a small business that conducts transactions across dozens or even hundreds of borders, especially if they are selling intangible goods, but as far as I know the legal environment has not been updated for that.
Hence it is a lot easier to use a middleman who handles the legal stuff with cross border transactions and you only have to deal with the middleman.