I've got a PIA user who bitches a lot about all the spam he gets. I recently told him that our filter catches about 400 spams per day. That isn't enough for him.
I decided to google for his e-mail address. I wasn't surprised by what I found. I got 57 hits. Two of them were our company web site, and the rest included lots of different sites.
Obviously it's good for the company that our people write articles on-line and get the company's name out there. At the same time, these users are doing something that causes them to get a lot of spam.
And I know he isn't the only one.