According to a virtual item trader of items in The9?s (Nasdaq: NCTY) MMORPG World of Warcraft (WoW), that price of most online game virtual items increased 30 percent on news of the upcoming implementation of the online game fatigue system on April 15, reports Chongqing Economic Daily. The trader said that underage gamers are now willing to purchase virtual items since they now have less time to play games and win virtual items. The system is now in a trial, and formal operation will begin in July.