Amazon, and I am not joking, in an article called Amazon: We have 70-80 percent of e-book market[0] through there kindle chief makes that claim.
Also credit suisse released a report prior claiming 90%[1] in the wall street journal.
This article itself also links to 5 publishers in a signed statement within an amicus brief claiming these figures and that dumping was taking place. thus prices set above that of a 90% market concentration single actor, make it reasonable to assume that increasing prices is infact the market rate.
Steve Jobs was a dick, maybe they were anti-competitive. I doubt they made 450million charging more than the market leader...
http://www.cnet.com/news/amazon-we-have-70-80-percent-of-e-b...
[1]http://blogs.wsj.com/marketbeat/2010/02/16/analyst-amazon-e-...
Nearly everything here is fact. So i find it difficult to understand what is being objected to...