Hi Guys,
Initially I was using GA on my site to serve a 468 ad and that was it - revenue was pretty poor… Probably about $5/10 a day.
After removing this, I added a leaderboard and box ad, as well as one Link Unit ad and things improved - I started getting eCPM’s of beyond $.50 and making around $30-40 a day.
Past few days I got a bit greedy and added two more Link Unit ads, and the eCPM seems to have dropped a little bit.
Now I know Google rates fluctuate a lot for me, and always have, but is there anything people here can suggest to help me perhaps stabilise and improve it? I always give ad sense at least 100k page impressions a day also.
Would eCPM improve if I were to remove some of the Link Unit ads (I’m currently running 3 in total) or is it just simply a case of rates will fluctuate regardless.
Oh, my CTR is always fairly poor… it’s about 0.06% this month - not sure if this has an affect too?
eCPM is a calculated value: earnings/impressions * 1000
If you serve more impressions by adding a low earning Ad then your overall eCPM goes down.
What about your individual Ads eCPM? That should have remained relatively constant.
By the way, medium and large rectangles perform best 
StarBuG
Thanks for the reply! This is really bad, but I never actually track individual ad performance, mainly because google ad sense never made me enough for me to care! I’ve only started taking notice because I’ve started making $50+ a day from them now.
I removed one link unit today and added individual ad tracking to the 4 ads I am running today to track performance. Also replaced one of the ads with a rectangle and my eCPM is up to $0.50 today.
I noticed the link units I am running are largely irrelevant and have barely made any money, with very poor eCPM’s. Might remove this.
Yes, test a few days with those custom channels and analyse the data then remove anything that doesn’t perform well.
I don’t know what is the site you’re running GA on and why your CTR is so low, but improving CTR with an optimized ad placement is one of the easiest way to dramatically improve eCPM.