You're confusing your statistics here.
When people are talking about spam, they are referring to 40-50% of email traffic being Spam. See for example, this April 2003 story in PC Magazine: http://www.pcmag.com/article2/0,4149,1046838,00.as p
With P2P (as various ISPs posting to this thread have said) it is 60% of all traffic on an ISPs network.
http://www.pcmag.com/article2/0,4149,1046838,00.a
With P2P (as various ISPs posting to this thread have said) it is 60% of all traffic on an ISPs network.