You have likely heard the expression that owning your own product is the key to making real money online. That is true for a number of reasons. One of the key reasons why that is true is because, if you own the product, you can create a sales funnel that you control and you profit from at 100% (or whatever amount you choose in regards to your affiliates, etc.).
If you don’t own the product, then you can’t control the sales funnel, and you don’t profit from any additional sales made through that funnel. It is a known fact that virtually every Internet marketer makes most of his/her profits via the back-end of the sales funnel, NOT the front-end.