Testing has become a key online marketing discipline for increasing conversion rates and getting more out of search/pay per click traffic. Some of the biggest testers in the world are Amazon and Google. In fact, testing is one of their “secret weapons.”
http://www.seochat.com/c/a/Search-Engine-Optimization-Help/Testing-SEO-Landing-Pages-and-Improving-Conversion/
Mid Sized SEO Monopoly networks generally run under 1k/Month and include 5-10 new sites and SEO campaigns in your niche.
