I re-run the same campaign recently with everything exactly the same the first time I ran this campaign except for the landing page. the new landing page got higher quality index than the 1st time however, the CPC is much higher also less impression as well. why is this? I thought the higher the quality index the better (less cpc and might be more impression)
Add some good content to the site.. probably related articles from ezine & post it on the site then try a new campaign...
Hmmmmmm it sounds like you may have just taken on another competitor that has big budget and doesn't mind spending a good deal on his CPC. Has your CTR dropped too?