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I expect to see my impressions coming down a little, and CTR going up as a result.
Hope Google doesn't get this as a flag...
As admin I access the site to reply to forums, post new content (no ads in admin pages), and check the format after the content is posted.
Every time I do one of these things my impressions go up. If I remove myself from the pool, the impressions will go down, but the clicks from users will remain - therefore higher CTR.
CTR = clicks/impressions
new CTR = clicks/(impressions - my impressions)
Althoug not many, I'd say I have something like 50 impressions on a single day - entering articles, answering forums, checking the articles are ok.
On 5000 impressions a day it could be 0.5% more, depending on the number of clicks.
The only downside I've noticed is that I'm not immediately aware of any problems google might have in displaying ads. Fortunately, that's been rare so far.
With AdSense, it's not the number of impressions that matters. That helps those of us with smaller sites with killer content. Even if Google sees the spike in CTR and sends a fraud alert, just let them know what you did. They will be able to verify it, and I'm sure will understand (they are making more money with a higher CTR).
PS: I would recommend logging in as a regular user every once in a while just to make sure everything is still looking good. You never know what can happen.
I want to get the closes to the number of impressions from real users, and I think it's working fine.