Why smartpricing occur on AdWords visitors?

why it occurs? Is it difference between "normal" visitors and from AdWords?

[net_rambler]

Hello!

I read here many times that when people try to icrease traffic to site with AdWords, smartpricing decreases eCPM after a few days(weeks).

I do not understatnd why it happens? If Adwords campaign is targeting the same keywords that are on the site, why eCPM is decreases? People that come from Google's SERPs use the same keywords, find my site there, come to site, browse, click adds or leave...

Is adsense aware that some people are from AdWords?
Or it is just bad targetiing, when people try to buy any traffic and of course it will not be well targeted...

I do Adwords campaign for keywords X and Y and other people coming from Google searching for X and Y also

Why Adwords traffic does trigger smartpricing and presses eCPM down?

[kaz]

Im not sure your initial assumption is necessarily correct. It may be a correlation many experience, but i doubt it 'caused' by adwords directly. In your description, I wonder if you consider the user is clicking on paid ads (yours) to view more paid ads about the same topic. Perhaps they are not looking for more ads, but what they are actually looking for? Thus a lower ctr/conversion - because the source is the same/redundant.