Just like with any system, it's all a numbers game.
Source:
http://www.clickz.com/clickz/news/20...d-malware-2010
Quote:
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More than 10 billion online ad impressions served up in 2010 carried malware, according to recent research from Online Trust Alliance. The organization, dedicated to establishing best practices for ensuring data privacy and security online, argues that delivery of ads transferring malicious code could be prevented if ad networks and other ad third parties took care to know their business partners.
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