arafay - 10:53 am on Sep 18, 2013 (gmt 0)
Actually google has far tougher rules, terms and conditions for advertisers than they have for organic listings. The introduction of quality score was introduced to make sure that ads are relevant to the search term and also to implement quality control. Similarly the landing page and the ads must meet certain standards. For most serps the quality and variety of sites appearing in sponsored results is better then the listings appearing in organic results. This is great for google because over time people will tend to click on the ads in preference to organic results because that's where the best/legitimate results are located. This gives google a very good excuse to introduce more ads in search results.
For eg. take a 404 error page and malware infected sites. I regularly come across 404 urls in organic results and also sites 'that could harm your computer'. However, in adwords, they immediately suspend your ads if your site is down or it has malware on it.
I think publishers must start investing in social media optimization to replace the search traffic lost to google ads.