I gave this presentation at the Operator API seminar at MWC14. To some degree it is based on a global developer survey which we conducted to better understand how developers perceive the value of operator APIs and services.
You can find a blog post with more details, the slides and links to the white paper "The Value of Operator APIs for Developers" here:
http://manfredbo.tumblr.com/post/78755173151/operator-apis-what-developers-think