deadsea - 4:53 pm on May 7, 2012 (gmt 0)
I discovered something interesting in google webmaster tools. Under "Your Site on the Web" -> "Search Queries" I used to rank #1 for some queries that get 100,000+ impressions per month. Now if I sort by "Avg Position". I see that I still rank #1 for lots and lots of terms, but the top terms that I rank #1 for have at most 3000 impressions per month. It makes me wonder if this is because those terms are less competitive or if Google applies to "too many ads" filter to the SERPs only when there more more than 3000 impressions a month.