Search ranking is not all about keyword density and constant new content. Sometimes it’s more about who you know than what you know.
To get a high quality link back to your site, make sure that the page you are linking from is relevant.
If you are selling spare parts for tractors it doesn’t make sense to advertise in Vogue… You can put all the effort and money you want into the ad, but it is highly unlikely that you get any return on investment.Linking from really random websites has a similar effect both on direct sales and ranking.
Sites that are relevant to each other mean higher quality links which in the end means better rankings.

