Websites and blogs that rank high pull in a lot of traffic for their particular niche, and that's why some people are willing to try practically anything, in order to get their sites ranked.
By doing this you are increasing the number of quality back links to your website, a factor that search engine bots take into account when ranking your website on search result pages.
When it comes to juicing, one thing that you want to keep in mind is that the best way to keep your juice from changing color is to add lemon juice to it.