Wanted to see if anyone else has noticed that by having history in Adwords, Google will actually give your site(s) more merit for where it ranks after the campaign ends. Tried this twice now with some random niche based sites and the overall SERP ranking increased or sustained its position well after the campaign has ended. Months or even years later. In other words invest a few $xxx for a month or two to market your site, exhaust your available credit in Adwords, and then see long term benefits specifically in less competitive niches. Anyone else care to confirm or comment?