In addition to the effects on the game economy, the sudden influx of currency or items also affects players involved in real-money trading.
In the EverQuest II case, the dupers attempted to sell the illegitimate currency on Station Exchange for real money and supposedly made over US$70,000 from online auctions.
In reaction to what was perceived to be an unjust punishment, several players joined a mass demonstration at a central location in the game world.
SOE responded to the disruption caused by the large gathering by teleporting all player characters involved away from the demonstration area.
[3] An immediate, although often temporary, step to prevent further issues from duping calls for aspects of the game to be disabled until the exploit can be addressed permanently.
SOE stopped Station Exchange auctions to prevent the dupers from selling the illegitimate EverQuest II currency.
[1] The video game Phantasy Star Online Episode I & II had a duping glitch, which was activated by talking repeatedly with a walking NPC and a merchant.
In the Xbox 360 game Forza Motorsport 2, there was a duping glitch which enabled the player to sell car upgrades they had not yet purchased.