used games is estimated to reach $2 billion this fiscal year, ending January 31. The figure represents almost 23% of the unstoppable corporation's revenue, and is $400 million more than the prior year. The Wall Street Journal notes that about 42% of the company's profits come from used game sales.
Further on in the piece, the WSJ covers how publishers are trying to incentivize customers to buy new, by adding extra content that can "only be used once." It leads by using Gears of War 2's "Flashback map pack" as an example of "an effort to diminish the appeal of buying a used game." That certainly would be worth noting, if the pack wasn't available to purchase now on XBLM for $5.