“The extremely high price of $10 (in 1974 dollars) for three slim pamphlets in a box must have sorely tempted consumers to take matters into their own hands; in the American Wargamer, George Phillies judged that “the rules are rather expensive—sufficiently over the cost of copying them, I think, that there are probably more pirate Xerox copies than licit copies in the world.” [AW:v2n8] Gygax would later conjecture, “I have no way of knowing how many pirated copies of D&D were in existence, but some estimates place the figure at about 20% of total sales, some as high as 50%.”
―
Jon Peterson,
Playing at the World