I subscribe to patio11's newsletter. Then I send a particularly good article from the newsletter to you via forwarding email. You say "Screw this" and hit the u

I subscribe to patio11's newsletter. Then I send a particularly good article from the newsletter to you via forwarding email. You say "Screw this" and hit the unsubscribe link. Happens all the time, and now you've unsubscribed someone who is a high value member of the list.