Hello, I have a website like hubpages where users post articles and we share the profits with them. Currently we use adsense only to monetize the site. Our CTR is (i think) great, about 2.5%-3%. But our eCPM is very poor, about 2.96$. We would like to improve our eCPM, so we are considering migrate our site from current, a generic site with lot of articles with categories and subcategories and an url structure like: domain.com/article-name to a several subdomains (one per categorie, about 23) and an url structure like: category-subdomain.domain.com/subcategory/article-name Doing 301 to the new placement. We think with this new build our subdomains will be more topic specif and our eCPM would raise. But we are worry about the impact in our traffic with this change. Could you give me some advices ?