That is a comment directly from a members of Blizzard Staff.The stroty follows below.

While we regret having to take such extreme action, these accounts were participating in activities that directly violated World of Warcraft's Terms of Use, including the use of third-party programs to farm gold and items. Such behavior not only negatively impacts the economy of a realm, it diminishes the achievements of those who play legitimately. We will continue to aggressively monitor all World of Warcraft realms in order to protect the service and our players from the harmful effects of cheating.

We'd also like to take this opportunity to thank the community for their assistance in reporting suspicious behavior. Numerous account closures come as the direct result of tips reported to our GMs in-game or emailed to hacks@blizzard.com.

Moving forward, if you suspect that a World of Warcraft player is using an illegal third-party program to farm gold or items, or is otherwise violating our Terms of Use, please report the suspected infraction using one of the methods listed above. All reports will be investigated, and the appropriate action will be taken when warranted