Ok I am just trying to calculate some stuff out.... and was curious if anyone had any insight. The site is an active community, with an average of 6.5 pages per visit and 66% of the traffic comes from SEO. Currently on the bottom left (3) is an ad placed on a website receiving roughly 1.7% CTR ($0.50ish a click) Lets say I move an ad to the 1 spot, how much CTR % can I expect to increase? Optimally I would like to have 4% CTR, but that may be hard with forums / community like site.