If you've placed AdSense ad units on your blog or website, you might be wondering why people aren't clicking more. Well, there are plenty of possible reasons. First, you should be aware that even if you're optimized, the majority of your users will not click any ads. Understanding that, you want to boost your chances of attracting clicks as much as possible. There are several ways to do this.
First off, remember that AdSense is a PPC, or pay-per-click, ad provider. Having all the junk traffic in the world won't get you anywhere, so it's important to put in effort to increase quality traffic, and ensure relevant ads are placed near your content.
Experiment with ad locations. Most experts agree ad units that are "above the fold," or visible without scrolling down, are the most successful, and can boost your revenue if used properly. However, every site is different, and perhaps some other location makes more sense. For example, if you write product reviews and have integrated ads toward the bottom of a review, perhaps users would be more open to clicking the ad after having just read your article.
Try different ad sizes. Depending on the layout of your site, large ads may fare better or worse than others. Try to choose an ad size that keeps your site looking professional and doesn't break your layout. Also enable image ads in your account, as users are generally more inclined to click on visually interesting ads.
When writing your content, keep in mind keywords you'd like to be associated with, and use those keywords in your article. That being said, don't go overboard and use the same uncommon phrase over and over — nothing is more obvious than an article that was written for the sole purpose of keyword "optimization." Write quality content that uses your chosen keywords appropriately. Much focus has been put on what the magical percentage is. Your best bet is to forget about the percentage, and focus on smooth, flowing writing.
Make your pages more specific. If you want to write an article about a specific camera, it would be best to focus all your attention on discussion of that specific camera. This makes it more likely that visitors to your page will actually be interested in that camera, and more likely that relevant ads will be served to you. Relevant users leads to a higher clickthrough rate, or CTR.