Let me give you an example. Fundraising companies use this method a great deal. Another example is those surveys that are sent out asking you to spend about 20 minutes of your time filling them out. You might find a dollar bill enclosed in the mailing to encourage you to feel guilty, and entice you to fill out the survey. And you'll often spend a lot more than one dollar of your time to do that.
Guilt is a strong motivator.
A satisfaction conviction is different. Basically, it takes the trial period and adds something that makes it go well beyond the trial period. Basically, you're saying to your prospect that you are so sure that they'll like the subscription, that you are willing to go beyond what is traditionally offered with other subscriptions. This in fact gives the reader the sense that the company really knows it has a winning product and solidly stands behind the product and your satisfaction. I received an e-mail from a company, a subsidiary of eBay, requesting my advice.