Honestly, about every month or so I unsubscribe to about 5-6 sites I am sick of and never subscribed to anyways (although sometimes you have to subscribe on some survey sites to receive credit for certain offers). In the majority of cases, it works and they go away in awhile. If you read the "fine print," often these sites will tell you it may take up to 1-2 weeks before the unsubscribe is successful.