A special issue of an academic journal on the Games industry and business models has just come out.
It is much cheaper than the consultancy reports and if you have access to a university library they might even have a subscription to the journal.
Also some interviews with European devs..
Useful both for companies and for teaching on courses..
See http://www.idate.org/en/Digiworld-store/No-94-Video-game-business-models-and-monetization_865.html
Aphra