Security software maker Marshal claims that of 622 respondents to a survey, 181 said they have purchased something that was marketed to them via spam. There are two ways to look at that number.

Marshal's analysis: The response rates to spam — especially if you only count the messages that don't get filtered — are higher than most people presume, and that's why spammers keep at it. My take: People who buy from spam are much more likely to take surveys. (Photo by cursedthing)

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