Well I've been testing this theory for the last few months and definately feel something is not right.
The new sites we launched a few months ago that are not being promoted on adwords are now doing well in natural serps. BUT the ones we immediately started promoting on adwords are still nowhere in the natural serps.
More shockingly .....
Three months ago we started promoting on adwords two of our sites that have been ranking VERY high for 4 years in natural serps. This week they have virtually vanished from the natural serps!
I now support the theory that if you display your URL on adwords it gets penalised several months down the line in the natural serps. (Maybe when a Google bod gets around to pushing the penalty button?)
Is this a clever tactic to draw more and more spend out of you? I think so.
I'm now not sure whether to cease all our adwords activity on high ranking domains? I think Google have us over a barrel on this one.
I think in future our policy will be:
Separate projects and urls for natural serps to those used for PPC adwords.
I'm quite shocked by what's happened.
Could be coincidence of course
