Don't tell me eCPM is not pre-set

EXACT same CTR and eCPM for April and May

[radix]

While I was checking my AS stats one thing caught my eyes, both today and the day before yesterday. CTR and eCPM for April (full month) and May (days 1-10 and 1-12) are the exact same figures. My page impressions are about 1 mio/m, CTR below 1% and above 0.4%, eCPM below $1 range. In other words and with not actual figures they look like:

Mnt Day.. CTR. eCPM
April 01-30 0.82 0.35
May 01-10 0.82 0.35
May 01-12 0.82 0.35

Is that a pure coincidence? Can it be with 1 million monthly impressions? Other than Google's fiddling/setting them, what else could explain such stats?

^{(OK, I know the column heading on the right says "Estimated earnings" - this, however doesn't make much sense as when you check last year's figures - it still says estimated (they should be real values, shouldn't they) - subject for another thread.)}

[incrediBILL]

Purely coincidence.

Happens.

[Rodeo]

In fact, chances of happening that are high for such impressions. For sites with lower impressions, stats vary significantly IMO

[martinibuster]

A coincidence is not a coincidence if it is a pattern.

• Do the April/May 2009 stats synchronize?
  
  
• How about April/May 2008, do they synchronize?
  
  
• Do the January/February 2010, March/April 2010 stats synchronize?

Is there a pattern? Or is it a coincidence?

[HuskyPup]

what else could explain such stats?

A consistent number of visitors to a specialised and well-qualified site?

I saw a similar thing for the last two weeks of February, my daily earnings did not vary by more than 5% regardless of the click volume. I actually had one day when clicks were 31% more than the previous day but the overall earnings were 0.06 in difference!

Yeah...really clever pricing:-)