I also have same traffic sources, but the best 4 are: quality content, blog commenting, email list and pinterest. (stevescottsite.com)
Conversion optimization gets you more money with the same traffic. (blog.kissmetrics.com)
Without a clear understanding of these settings, and how they may benefit you, you might be paying too much for the same traffic that a similar marketer pays pennies on the dollar for. (searchenginewatch.com)