Just found on the Internet:
Were e-book sales in the UK worth £105 Mio in 2011? This was the figure implied by Hachette UK when it stated last week that its e-book sales of £21 Mio amounted to a 20% share of the UK e-book market.
Read the whole story: http://www.futurebook.net/content/how-high-can-e-book-market-go
J.A. Konrath talks about the Self-Publishing Movement: Sealed with a Loving Kiss
However, Philip Jones comments on his blog:
Do publishers always get it right? Of course not. Are they learning fast? Sure. Publishing has gone from an industry that was 99% print, based on archaic rules and conventions and one serviced by multiple outlets who largely supported what it was about: to one that is at least 20% digital and dominated by one mainly adversarial customer. And this has happened in an incredibly short period of time, and at a moment when consumer purchasing has been uniquely damaged. Under these circumstances one might be tempted to give big publishers a break while they adjust and carry on.
My guess is: e-Books will get a bigger market share, but not more than 75%. Beautiful coffee table books will always stay with us. Fiction or non-fiction “How-To” books are perfect for e-Readers.