My big, main site (which is basically one page, with a few other pages for a disclaimer and other erroneous stuff) has been doing great the past month.
I have three ads placed "centered" -- one toward the top, and two at the bottom. These are big square ads, all text, no borders, blue link with green address. Standard Google.
So, it's been going great, but I've noticed the CPC dropping a bit.
With three ads, is it true competition is decreased?
I decided to remove the top ad (since I believe 95% of users scroll to the bottom, and I have a link ads up top anyway). I'll report how it goes.
Can this make a marketed and significant difference in CPC and CTR? OR, is having an ad toward the top simply too important to sacrifice? (I may remove one of the bottom ads and try that out, as well).