The other day we reported that YPN EPC Was Decreasing and we offered possible explanations as to the reason. However, today, I noticed a featured thread at WebmasterWorld named Declining eCPM where members share their experience noticing that although traffic is rising on some sites, the earnings for those impressions are declining.
eCPM "is calculated by dividing total earnings by the number of impressions in thousands."
Now this thread's title is just about the ads that pay on a impression basis. There are folks complaining about the CPC (click based payouts).
Forum discussion at WebmasterWorld.