For years, I focused on affiliate marketing and local business promotion. While both are excellent, failing to use AdSense was a big mistake. In fact, I think not using AdSense cost me at a minimum hundreds of thousands of dollars and perhaps millions of dollars. Because when I focused on affiliate marketing, I went after fairly competitive keywords that had buyer intent. I published massive websites that only published buyer-intent content with affiliate links. Because those keywords were fairly competitive, I did old-school link building which ultimately ended up receiving Google Penguin penalties. Had I used AdSense on those sites, I would have published all kinds of content and probably would have been less aggressive with link building and focused on building large, popular niche website s which is what I do. Please note that some of that revenue was generated from paid traffic so not all of it is profit. You can also read my income reports which covers 2 niche sites, one of which...