one advertiser is paying $1 or more to be guaranteed on top, and another is paying less...
I think you can't control that.
Posted via Mobile Device
Like mentioned earlier, you tend to get a better cpm with only one add. That way you know that only the top three paying ads will be displayed on your site.
I do have to disagree with the less ads, less ctr mindset though. I've actually increased my ctr marginally (about 1%) by cutting down to just one ad spot.
You can also google and find lists of websites that pay out low, then add them to your competing advertisers list so their ads don't display on your site.
This guy writes a sentence worth a world and nobody cares. Even someone answers "You cannot control that"". Yes you can up to a level.Smaller ad sizes so that the highest paying advertisers are the only ones showing.
Sounds like first visitor was from USA..
and
the second visitor was from India ..