We'd like to stress that it's not the number of sites you have, but the quality of those sites that will help you increase your earnings with AdSense. If you're just getting started with your first website and the AdSense program, we recommend taking the time to build up your site with plenty of original, quality content -- write about topics you're passionate about, or which you have expertise in. When designing your website, keep our Webmaster Guidelines and, most importantly, your users in mind.
Then, take advantage of our Webmaster Tools to help increase your site's visibility in the Google search index, and try out the tips our Search Quality Evaluators have provided. Once you've built up organic traffic to your site, use Website Optimizer to understand how users interact with your pages and make improvements to your layout. And of course, during all of this, experiment with AdSense optimization tips to learn which colors, formats, and placements monetize best on your site.
Finally, as we blogged about during this Newbie Fridays series, your earnings potential can go up as advertisers find that you're sending high-quality leads to their sites. This won't happen overnight, but with patience and hard work you can watch your efforts convert into a high-quality site and higher AdSense earnings. And you won't even need a hundred sites to do it :)
Link - from Inside AdSense
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