I just got a threatening letter from a collections company that was sent from Spin magazine. I never got an issue, just a threatening letter, and took this up with Spin's customer service. These magazines must be getting desperate lately, trying shove subscriptions at us then threatening if we don't pay. I told Spin I'll never ever subscribe on account of this.

These magazine sweeps aren't that bad.  As long as sweepers pay attention to what they are filling out...and read the fine print on the sweeps entry page...there wouldn't really be any unwanted subscription sign-ups.  True, if you accidently subscribe to a magazine while entering a sweeps, that's okay.  Just wait until the first unwanted magazine issue arrives in the mail.  Visit the magazine website; cancel the subscription.  Enjoy the magazine(s).  Threatening letters?  Never answer their letters unless they send a postage-paid return envelope.  Otherwise, only talk to magazine customer service via phone or email.  They are not going to sue anyone over a $7 magazine subscription, especially when there is no agreement and no actual proof that you subscribed to anything.  I like the motto "Get it in writing".