CTR effecting CPC

Per page or per site?

[KenS]

Hi. I have seen threads saying that a low CTR can result in a low CPC also. Makes sense as low price ads will probably be displayed. I have some channels with low CTR and was wondering if I should remove ads from these pages. This would make the site wide CTR higher but of coarse not affect the CTR of individual pages where ads remain.

If a low CTR means low CPC do you think this is calculated by G on a site wide average, or for each page individually?

What are other peoples experiences?

[david_uk]

Only Google can tell you this, and it's my guess that they won't divulge.

I'd suggest that if you don't earn a great deal with the banners with few clicks, then remove them and see what happens to the earnings on the productice channels. It really can't hurt. I monitor banners on pages and cull the unproductive ones.

The only difficulty is that there are so many things that could affect the cpc, then there may not be a clear pattern.

[sailorjwd]

I have some fairly direct evidence that CTR can affect CPC/EPC across the site.

Several weeks ago I had someone refresh one of my pages 60,000 times in two hours - that's 5 days of pageviews. Within an hour my CPC across the site seemed to have been cut by 2/3.

Luckily at the time I was switching my site from a personal account to a corporate account. A day later I switch all pub ids back to the personal account and CPC immediately returned to normal levels.

It may be coincidence but I think there are some site-wide calculations going on - maybe like 'trusted site' or something.