Hi there. Has anybody changed his large rectangles to medium rectangles lately. Was just wondering how a change like this has affected other sites. Is it normal that the cpc goes down for a few days when you try a new ad unit? Im testing this right now, after 2 days the ctr is pretty much the same, but the cpc on these ads is much lower. Will it need time to catch up? The blocks I'm testing get around 15k impressions/day. Thanx Martin
It depends on whose adertising in those blocks. Different advertisers pay different amounts, and even the same advertisers can change their bids.
it may depend on adverstiser's bid for the ads that are showing on your page, try to use high paying ads on your page and you will get more return for less traffic
I didn't think the cpc should go down after simply changing ad format from and to such similar formats/size.