littlecubpanda - 12:35 am on Aug 3, 2013 (gmt 0)
All you have to do to know if interest-based ads are a problem is to look at the metrics in your account. For the past month, IBAs vs. contextual varying by a couple of cents on RPM for me. They're so close.
Just check in your account and you'll know right away if they are dragging you down.
With respect to Full Sail, that's a good point. 99% of people never click on their ads, but 99% of people who SEE the ads remember who they are. Everyone now knows who Full Sail is without clicking on a single ad.
That's why I have all image-based ads disabled. Text ads require the user to inquire further to know what the ad is about. Image-based ads give everything away.