If you are wondering why your adsense earnings are not as high as you would like them to be, the first thing you must do is look at how many ads are on your site. Sites that are filled with ads without any relevant content to read, will not entice the visitor to stay on the site longer than a couple of seconds. Therefore, it is important that your website has relevant content with very few ads.
Another thing that a website owner must consider is whether to choose to place a text only ad, or an ad with text and image. You could also choose to run both of these ads on your site as well. Each of these ads have advantages and disadvantages. Text ads tend to load a lot quicker as compared to image ads. However, the click thru rate does tend to be higher on ads that are image ads. In other words, a visual ad will have the best conversion or click thru.
Increasing your CPC and CTR is what you are hoping to achieve, and in order to do this you must use relevant keywords in your post/page content. The use of appropriate keywords will increase your traffic and therefore, your adsense earnings should also rise.
Major search engines will also see the appropriate keywords and direct traffic to your website. So it is important that you write content that is informative, entertaining, user-friendly, and searchable. The CTR will definitely increase and so will your adsense earnings.
Another important thing to remember when placing Adsense ads on your site is the placement of the ads. Image ads placed above the fold, tend to do the best. Banner ads that are either images or images and text, placed above the header seem to have a high rate of click thrus. Ads that are placed in the upper right section of your website also tend to do well. This type of ad is placed in a widget and should be under your search button.
Remember that relevant content, keywords, ad type and ad placement are relevant to the amount of income that you earn from Adsense. If you have not seen any sort of income being generated from Adsense, try following the above tips and see if there is an improvement in earnings over a short period.