If you've been burned by a subscription service, you are not alone.
I recently lost $40 to a domain registry company (bet you can guess which one) because when I was trying to set up a domain registration for a web site for my wedding (over two years ago) I wasn't paying enough attention to a form with an "auto-renew" radio button checked by default.
My wife and I just celebrated our first anniversary. Needless to say, I don't need the domain anymore. About two months ago, aforementioned corporate giant bills my wife's account for around $40. The only reason we caught it is because we are getting ready to move into a new house and we were analyzing our spending habits.
I feel as though I was a victim of bad form design. Why does it seem like crap like this only happens with subscription services? Don't give me more service than I need Mr. Phone Company. With the amount of sites that go offline every year, they should know better than to check the "auto-renew" radio button by default.
An alternative form design, and a much better one in my opinion, would have been to call attention to the fact that eventually the registration will expire and if you'd like to prevent that, check this box. Is that so hard?