Forum Moderators: martinibuster
The more you earn the more Google earns. So why would they penalize you for being successful?
So that they earn even more off one's hard work!
1) There may be only so many high-paying ads in the publisher's niche, and at some point the publisher may be getting fewer of those ads because a daily quota has been exceeded. (It wouldn't be unreasonable for Google to spread ads around instead of letting a handful of publishers drain an advertiser's budget.)
2) If the publisher has optimized his pages for clickthroughs, clicks may be growing faster than conversions. A falling conversion rate may be accompanied by a deeper "smart pricing" discount for advertisers, resulting in lower EPC and ePCM.