If you have not paid attention, then you likely don't know that there has been litigation over the consumer price of ebooks and whether there has been price fixing. In a Publishers Weekly article:
According to a recent filing, publishers have paid a total of $166,158,426 to settle state and consumer e-book price fixing charges, including an additional $3,909,000 to settle consumer claims in Minnesota. (Full article here.)Beyond the Book has a podcast on the verdict in the Apple lawsuit, which is worth listening to (13 minutes). The person interviewed in that podcast, Andrew Albanese, has written a book on this topic entitled The Battle of $9.99: How Apple, Amazon, and the Big Six Publishers Changed the E-Book Business Overnight, which is an ebook ($1.99).
These lawsuits have nothing to do with copyright; however, the price paid for an ebook does impact the copyright fees that might be paid to an author.