Amazon prepping for paid ads on Kindle?

While sales of Amazon's (AMZN) Kindle electronic reader have exceeded expectations, there is a groundswell of complaints by its users over the cost of books in the Kindle format.

Amazon prices newly released bestsellers at around $10, and the buyer does not have the right to resell or pass along the book. Now a report suggests that the company may be planning to reduce the cost of books by inserting advertising within them.