Buying & Selling on EBay While Giving to Charity

My husband is now working on the charity-related auction program within eBay and their umbrella name is Giving Works. Giving Works allows buyers to search by items that donate parts or all of their proceeds to charity. It also allows sellers to donate a percentage of their sale proceeds to the organization(s) of their choice. "Help save an animal every time you shop" is one promotion they have, for example, but there are many. Supposedly over 10,000 nonprofits are in their system and users can add others.