Adwords - tracking referal revenue outside direct clicks ?

[Whitey]

Does anyone have a handle on different industry trends for folks clicking on Ads then referring to another user which results in sales ?

My initial thoughts are that the majority of webmasters & business' couldn't easily account for this. Any ideas ?

[Whitey]

.... no comments , so i thought I'd post again to try and trip some thoughts.

I mean i hear a lot about PPC not making a profit from some quarters , but what stats and how is that being estimated in light of referal traffic outside of the cookie tracking range. what are the estimates and how's it done - Anyone got any ideas ?

[edited by: Whitey at 9:53 pm (utc) on Jan. 22, 2009]