An awful lot of my decision making in the last ~13 years has included the question: what if the Camels don't exist tomorrow? Which isn't particularly unusual for a business, but it can make planning difficult.
No other major retailer has anything close to as many skus as amazon. And for any of the sites that do have a lot of products via 3rd party sellers, most of those products are much higher priced (they are probably being drop shipped from Amazon) and those prices don't change much.
So I think ccc would lose a lot of its usefulness.