I am a member of quit a few affiliate programs, and I must say the I find Amazon the easiest and most convent program to navigate. They give affiliates a lot of choose in how one uses their products. To promote the commission may be low in comparison to other affiliate programs but the name Amazon does sell when you stay with them. I am happy to be an affiliate for Amazon.
Giving away a free informational product such as an e-book, an email series or a mini-course is a popular tactic many affiliate marketers use. Usually, your readers will have to provide their email addresses to receive the product from you. You can then use this to sell to them via email marketing. Additionally, an informational product can generate interest in the actual product you're trying to sell. If your product is popular enough and brings enough traffic to your site, you could also monetize the traffic in other ways, such as AdSense.
In Amazons defence, they offer you a near unlimited choice of products to advertise, if you have targeted traffic I think it would be well woth incesting some time in to doing some A/B testing on the products you are advertising, and how you are advertising them. The fact that you are making low sales if you have traffic will be more down to what you are doing than Amazon.
But let’s be totally honest for a minute here. There are millions of blogs out there, and a fraction (I dunno, less than 10%?) of bloggers are earning any money at all. And even fewer are earning full time income. The fact that I was able to join the ranks of “the full time income earning bloggers” just 7 months into blogging is sort of unbelievable. (Only, do believe it, because it happened!)
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.