I propose a cash shop item in the furniture section of a goose in a nest, that once purchased and placed in your home, produces 1~3 golden eggs a day when harvested.
Every day, you can harvest from your goose and get a small number of golden eggs to help advance your pet. This will: 1) Encourage players to log in every day. (2) Alleviate the unnecessarily arduous task of the quest "An Easy Lay"... since NO ONE likes doing it. (3) Introduce a new cash shop item that will be a necessary, but unrequired piece of furniture that most people will purchase on multiple toons.
I would suggest that it would be limited to only 1 per character, but that's optional, as since the golden eggs can't be traded anyway, the number of eggs produced would be only beneficial to the person purchasing the geese.