This is a compilation of the icv2.com retailer surveys of Top Five Roleplaying Games. They are generally compiled quarterly (with some exceptions). ICv2 notes that "the chart [are] based on interviews with retailers, distributors, and manufacturers."
D&D pronunciation. Does it matter? No. Can it be fun to discuss? Sure! While pedantry over pronunciation is the opposite of charisma, that's no reason not to look at the etymology of some of the words we use in our games.
Wizards of the Coast regularly surveys various aspects of the adventure gaming channel; distributors, retailers and consumers to better understand their preferences, concerns, and needs. That data is regularly reviewed and distributed internally to senior management. The contents of this file are excerpts from those sources; the source materials themselves are confidential internal documents and are not available to the public.
This is the multi-year Q&A sessions held by D&D co-creator Gary Gygax here at EN World, beginning in 2002 and running up until his sad pasing in 2008. Gary's username in the thread below is Col_Pladoh, and his first post in this long thread is Post #39.