One of my sons (he's 25 years old) has a popular hobby site he has run for more than seven years. Throughout his site he shows an adsense block in the sidebar, along with a few links to ebay products on pages about various hobby related products. In a nutshell, its a hobby blog.
He doesn't follow ANY webmaster forums and as far as I know, he has never worked on things like backlinks, or any of the other things us SEo's do. He's kinda clueless to web design, seo, marketing, etc... he just likes his hobby. If I had to find anyone building a site strictly for its users without worrying about search engines, it would have been him.
He took a significant slap-down over the past 2 days. From 25k uniques/day to 5k/day from search. 100% of his loss was from Google search.