CMidd - 9:18 am on Oct 31, 2011 (gmt 0)
I'm also tried publishing later in the day, and my CTR is lower and average PPC is lower.
I have also seen this as an advertiser.
when running a super low daily budget campaign I was constantly getting alerts that my daily budget was to low, and my ad stopped showing and i miss out on X amount of possible traffic.
after a period of clicks my ads budget stopped my ads from showing.
I also managed two campaigns. One for Content network, and one for Search. both using different budgets, so my content ad could be stopped, but my search ad were still showing.
I sent most of my search traffic to page that Called to Action Facebook Likes over Adsense clicks.
No, I'm not a mouth piece for Google or a Google Sympathetic, I personally don't like them, and have been doing everything i can to reduce my income and traffic from Google "and it's working"
But the truth is the Truth.
Google doesn't pay you, Advertisers Pay you!
There isn't an infinite amount of ad money out there!
Advertiser have limited budgets, and if your not positioning yourself to get the most of that budget, by the time your traffic rolls in, you will get what's left over.