Reuter :: As best as I can tell, quote approval thrives in the places where reporters vastly outnumber sources, creating a scarcity arrangement that sources can – and do – capitalize on. Scarce sources in such places as the White House, Capitol Hill, some federal agencies, Silicon Valley, Hollywood and the entertainment industry, and on Wall Street have the necessary leverage to extract concessions out of the reporters covering them.
Thoughts, statements by Jack Shafer, blogs.reuters.com
Most recent discussion also mentioned in Jack Shafer's piece:
"Latest Word on the Trail? I Take It Back", read Jeremy W. Peters, nytimes.com
"The Puppetry of Quotation Approval", read David Carr, www.nytimes.com
"The Times Needs a Policy on Quotation Approval, and Soon", read Margaret Sullivan, publiceditor.blogs.nytimes.com
"New York Times bans quote approval, kind of", read Erik Wemple, www.washingtonpost.com
HT: Margaret Sullivan via Twitter