I have seen Amazon affiliate sites that were so poorly done they made nothing or maybe were lucky to earn $20 to $30 per month. And I have seen some that make well over $1000 per month. But if you speak with experienced Amazon affiliates they will tell you that the average is probably somewhere around $300 to $500 month, per site, which is why most of the pros have ten or more sites.
Cost per click was more common in the early days of affiliate marketing but has diminished in use over time due to click fraud issues very similar to the click fraud issues modern search engines are facing today. Contextual advertising programs are not considered in the statistic pertaining to the diminished use of cost per click, as it is uncertain if contextual advertising can be considered affiliate marketing.
You may have noticed in my overview of the Amazon Associates site that I left out the mention of the plugin they built for WordPress. That’s because the plugin doesn’t work (at least not well). Luckily, the Amazon Auto Links plugin will simplify the process of finding new and relevant products to promote and creating affiliate links to them--all from within WordPress.
I have started looking at affiliate networks and finding products to promote that way. Also going to try to utilize a Youtube channel with promotion, as well as some paid advertising. It all works with the right amount of patience. I do have an Amazon Affiliate account that I can link too, but diversifing and learning to branch out is key. Truthfully I do not think the Amazon associate program is all that newbie friendly.
You can open a store without the burden of managing inventory. One of the ways in which you can use Amazon affiliate links is to populate your online store with third-party products. This spares you from having to produce, store, or even manage inventory. That’s all handled by the manufacturers. You only need to worry about maintaining your online store.
Is this because WP is now blocking outside adds on free accounts? WP recent advised users that ads may appear on free accounts. I saw that WP has a plugin just for Amazon posts, but any plugin requires a business account. In looking at the pay-to-play WP account details, it looks like one has to buy the second level account in order to “monetize your website”.
Find a profitable niche. Starting with your interests, write down as many niche ideas as you can. Think about topics people might search online. Ideas include passions (like surfing or body building), fears (like spiders or speaking in front of crowds) and problems (like getting out of debt). Do keyword research to see it others are interested in the topic. Find out if a domain name is available that matches the keyword 100 percent. 
It's especially true now that the big media players are finally waking up to affiliate marketing (NYTime buying WireCutter and SweetHome) and BestReviews (which was already an epic product review site in it's self due to the fact they built their own 10,000 sq ft testing lab) being acquired by Tronc (owns the LA Times and half a dozen more publications).
There is no shortage of products you’ll be able to promote. You’ll have the ability to pick and choose products that you personally believe in, so make sure that your campaigns center around truly valuable products that consumers will enjoy. You’ll achieve an impressive conversion rate while simultaneously establishing the reliability of your personal brand.