The add incentive button allows you to re-market to a user that has already viewed that particular product. Its a great way of encouraging a user back to your site with a discount. Each time you add an incentive, we will send that user an email making them aware of the incentive amount. We can also offer you more exposure by sending the same incentive email to the users network of friends/followers. Simply select the appropriate option on the Add Incentive popup and we'll take care of the rest for you.