I honestly think some of us just have non-buying audiences. Some of that may be a matter of how or what we write but some of it might just be the niche. There are some niches that seem to just go hand-in-hand with spending money — home décor, for instance. My niche is largely broke moms from large, single-income families. They don’t HAVE money to spend if it’s not on essentials. So there’s got to be a balance, I think, between recognizing what we could do differently to improve conversions, and recognizing the reality of our audiences.
Some subjects are much better paid than others, so although you may love the idea of writing about travel (badly paid) a better bet would be a niche like finance (much higher rates of pay). Check out the Pro Blogger job board for high paid freelance writing jobs – other places to look might be Textbroker or you can look at the “gigs” section on Craigslist.
Be sure to check what kind of customer support you can expect from your affiliate program once you have signed up. Do your research online and if possible, speak to other sellers using the program to get their thoughts. Can you speak to someone via phone or Skype or do you have to wait 72 hours for email responses? Be clear on this because trust me, you will need support at one point or another.