This is just one account of what is going on with Amazon and their indie publisher owned by them, Createspace:
http://jeanettevaughan.wordpress.com/2013/03/04/back-by-popular-demand-the-amazon-rip-off/
There was a petition by famous authors against Amazon and how they were trying to destroy Hackette Publishing.
They will give away authors works for free on that Amazon Prime and not pay the author royalties.
Amazon should only be allowed to sell products that can not be held hostage for royalties.
We do have authors on FR whom Amazon regularly gives away works of for free.