Someone is making money somewhere and the people you're pitching to are most likely wondering who that is and how the money is being made. You can make the no strings argument all you want, but obviously, you're not telling people about this out of the goodness of your heart, and the company that is running the program isn't doing it as a non-profit program. So most people are probably wondering what the catch is and how the program generates revenue. That might be something you want to address. Do the stores pay a fee to be involved? How does the program generate revenue for the company that offers it and is there anyway that can boomerang on the people who sign up.

There isn't any such thing as a "no-brainer" when it comes to these programs. Almost everyone has been burned at one time or another and so most consumers are cautious. You have to anticipate their objections and questions and answer them before they come up.