Results of the survey show that more users are adopting greynet applications while, at the same time, little progress has been made toward combating greynet-related attacks. Greynets – real-time communications applications that are often introduced by end users and use highly evasive techniques to traverse the network – pose myriad network and information security risks because they provide vectors for malware, intellectual property loss, identity theft and compliance risks.
A typical organization is estimated to spend nearly $130,000 per year on average to repair damage from greynet-related attacks, while the largest companies are estimated to spend upwards of $350,000 per year repairing damage from greynet-related attacks due to higher incident rates.
http://www.it-observer.com/news/6950/81_it_managers_report_security_incident_due_im_or_other_greynets/