The funny thing is, I have no idea why I'm getting this as I didn't have any subscriptions to anything for the past few years. I even checked the label the first time I saw it in the mailbox, thinking that it was placed in the wrong mailbox. Nope - it's my name and address on it.
Certain types of free copies count toward ratebase. Magazines need to make ratebase to avoid a drop in ad rates. Since more revenue comes from ads then from circulation for many magazines, it's worth giving away free copies.