Ha! When I need to get work done, I tell myself "Don't Do It!". My favorite is "Don't drink that beer until you're finished with your work!"
Yes, these ads are very effective. We see it in IM a lot, too. "Don't buy this until ... " Usually an affiliate with a bonus.
Weird how the human mind works. We have to read reviews before we buy something, but just seeing something that says 'don't', first, we are whippin' out our credit card.
How often have you looked for a review online for some product or new service and saw those "Don't buy until..." titles all over the place?
Well, they are hardly original. They have been working since the 1860's.