Many webmasters send traffic to a sponsor without realizing the amount of "leaks" or non paying links that are within a sponsors website. Its important that when you send your traffic to a particular niche/sponsor/product that you are aware of your surfers destination. Are you getting paid for "all" sales within a programs site? It always pays if you follow your outbound affiliate links and scrutinize how to best make a sale without handing over all your traffic.
The best way of monetizing your traffic is by building your own product tour and send the customer direct to the join/pay page, thus avoiding most leaks.

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yea right.... if we avoid traffic leak then we could really earn more than usual.