As a test I put Amazon products on 10 of my sites covering all different subjects. Self-improvement has a lot of clicks and very few sales. Health and body care products give me a conversion rate of 3-4%. Seems like it all depends on the niche. Set up some tracking ID's in Amazon and test it out for yourself.
I made 100 click & 5 sale on ppc traffic but on natural search I made 100 click/15 sales but now ppc is END I want more traffic...
Yep. It's all about how prepared they are to buy when they click, and where your traffic is coming from (or why they are there). Highly targeted will generate a higher conversion ratio....just targeting traffic, any traffic is like throwing up a bag full of marbles and hoping to catch a few in your hat before they hit the ground. It can be profitable with a ton of traffic, but you can make the same, or more on less traffic if it is targeted properly.