Many threads here include numbers publishers self-report concerning their account activity. I wonder if we're comparing apples to apples?
For example, if you get numbers from a report that only counts channels that received clicks, your CTR is going to be overstated.
Or maybe you have more than one channel assigned to an AdSense unit. If you look at a report totaling your channel activity, again your numbers may be overstated.
If you look at a report that doesn't including earnings for AdSense units that don't have a channel assisgned to the unit, you may be understating your numbers.
Does the report you are using include both content and search or just content earnings?
FarmBoy