Andrew, sez, "Cards Against Humanity (the Kickstarter-funded, adult version of Apples to Apples) made a 'pay what you want' holiday expansion. They published the results of the experiment."
Camille adds, "The results are detailed and interesting...they list out their costs and revenues, with a map showing average price paid by state, and a fun exploration of what they could buy with the profit they made ($70K). And the best part is...they didn't buy any of that stuff, and instead made a generous donation to Wikimedia!"
Cards Against Humanity: Pay-What-You-Want Holiday pack
(Thanks, Andrew and Camille!)