Has anyone done any research or know of any research that has looked into the effectiveness of incentive programs like British Museum at http://en.wikipedia.org/wiki/Wikipedia:GLAM/BM/Featured_Article_prize ? Or into the effectiveness of wikicups like Bacon at http://en.wikipedia.org/wiki/Wikipedia:WikiProject_Bacon/Bacon_WikiCup/2012 ? Do they spur collaboration? Do they engage new audiences that may not otherwise have worked on content or similar content?