fmltube

I am trying to understand a bit more about traffic and its role in driving sales. Now I understand not all traffic is the same but if traffic doesn't convert, does it fall on the affiliate or does it fall on the sponsor? I realize that different traffic sources may convert better than others depending on the user but where does the ultimate responsibility of the sale come in? At what ratio do you decide to drop the sponsor and focus elsewhere? I guess what I am trying to ask is the job of the affiliate is to get the traffic to the sponsor and its the sponsor's job to convert the sale, right?

Appreciate any insight on this.