You’ve built a fairly large portfolio of websites you market for. Many of them offer coupons, and you want to join them together. This concept allows you to combine all of your offers in one gathering place, easier for your prospective buyers to find. They can compulsively buy with much greater ease.

Offering visitors an easy way to take advantage of your coupons, and gather information using your resources (search features, accounts to save coupons, etc) to find a great deal on the products you sell. Discount codes and coupons make the largest impact on visitors who are not necessarily looking to purchase anything, getting them to spend, generally in larger dollar figures than people purchasing out of necessity. This is because they (the people buying out of necessity) are making the purchase, they are actually thinking about and researching the product they are searching for.
A good starting point to see how one of these websites operates, check out GotApex.com. They do it very well, and convert a ton of sales, especially on electronics. (I am not affiliated with this example whatsoever.) I guarantee you have a hard time leaving without finding something there that pulls you off there page to an affiliate store.