could be another webmaster beating you to the ad budgets.
5 "super related" advertiser in my niche spending $100 each a day.
Avg click = $1.00
500 clicks total. << There is a Finite Number of Clicks in a niche!
First related traffic to reach them and suck up those 500 clicks wins.
After the 500 clicks are gone, their ads disappear.
Traffic after that gets crappy cheap ads.
I have seen this on one of my sites, after a certain time of the day the good ads stop.
I have a image only 300X250 on a page.
Early on in the day "in private browsing" this same super related advertiser dominates that spot and dominates it on my competitors site as well.
Highly targeted 300x250 image ad that is designed directly toward my niche.
Later on in the day it's gone, and it's gone from my competitors sites as well.
Their daily budgets is gone.
After that cheap, non related ads take it's place.
I learned, The First person to get related traffic driven to those pages and drive ad clicks will likely be first to get the biggest piece that budget.
It's not always about driving a lot of traffic, it's about being first to that traffic.
with X amount of users and X amount of clicks. The first to get those user and drive those clicks win.
So i use Facebook.
I spent the last 6 month investing in a huge Facebook Page.
Now I can send thousands of page views of traffic directly to those pages, before visitors need to search "or visit my competitors sites"
After posting on Facebook to my large group of fans, I'm sending tons of Ad clicks "and sucking up the budgets".
I do this early in the day "between 11am to 5pm"
Normal organic traffic doesn't usually start rolling in until the evening.
visitors of my site, and member of my Fan page are also visitors and member of my competitors sites, but I'm first.
user don't typically click on the same ads twice.