Since optimizing my Adwords ad for product X, my conversion rate has dramatically increased. Take heed that your ad copy is important in drawing customers that are willing to buy, not just look.

Another happy benefit is that using a big name affiliate like Amazon, Buy.com, Walmart, etc., is that people will continue to shop and buy other products. So far I have seen the following with Amazon:

1. Someone upgraded and purchased a more expensive product
2. Someone purchased multiple DVDs and books
3. Someone downgraded and purchased a lesser model (but hey, I still got the sale)
4. Someone purchased kitchenware!

I think you’re getting the point. Get customers to a big named affiliate with a diverse array of products and you will reap the rewards.