Using different PPC firms based in part on the upstream provider?

[David G]

Can anyone give a list of the upstream providers to the major parking firms?

i.e. which ones use Google vs Yahoo, or perhaps even some other provider. Have always been a bit confused on this and have noticed when Domainsponsor and others do posts and press releases they seem to refer to their 'provider' rather than mentioning who they are for some odd reason.

The reason I am asking about this is ideally I would like to rotate testing with ppc firms based on the provider they use as the results would seem to be much different vs rotating with 2 places who both use the same provider. Plus, I suspect my results would be better depending on the upstream provider used who may or may not fully appreciate my particluar traffic and categories.

Any opinions on this idea? Anyone else do this?

 

[alex75]

and have noticed when Domainsponsor and others do posts and press releases they seem to refer to their 'provider' rather than mentioning who they are for some odd reason.

The Google's standard contract does not allow anyone to say the Google's name.