This isn't so much the problem with self-published books, as with books that are self-published and more or less "self-sold". I wrote a bit about Authority here: http://blog.liberwriter.com/2013/11/21/nathan-barrys-authori... and think this is a real problem. I don't like not having reviews. There are some books that look interesting to me, like this one: http://www.rachelandrew.co.uk/books/the-profitable-side-proj... where I'm a bit reticent because of the lack of reviews and Amazon integration, combined with a higher price than I'm used to.

I don't think that everyone selling their own books on their own sites is a stable equilibrium.