Well, it's not as if this comes as any surprise: Spam is starting to hurt email. It's from Pew Internet and American Life, a project studying the Internet and its impact on ... well, everyone (it's a U.S. organization).
I can't find anything on the site that shows what "Pew" refers to. Is it someone's name? An acronym? Who knows ...
Here's the discouraging thing about this report: "Some 7% of emailers – more than eight million people – report they have ordered a product or service that was offered in an unsolicited email."
And that's why we get spam. The boneheads rule.