The MAAWG conducted 800 interviews by phone and Internet across the US with people who had e-mail addresses not managed by a corporate IT staff.
Slightly less than half (48 percent) said that they have never clicked on a spam e-mail. That's the good news, but that means the other half have clicked on or responded to spam. But why? The answers will undoubtedly horrify you. A full 12 percent said that they were interested in the product or service being offered—those erection drug and mail order bride ads do reach a certain market, it appears.
Reports vary on how much email is actually spam, this article quotes 97% of all email is spam, I've seen other guesstimates but almost all are in the 90%. With that many people responding, its little wonder why there are so many people in the spam business. I would be willing to guess that is a better return than TV ads get or door-to-door salesmen.