Sand - 6:39 pm on Aug 3, 2012 (gmt 0)
One more thing I want to add:
At the beginning of this year, the AdWords reps were re-organized so that each group of reps now works exclusively with sites in only a couple of niches (before, I *think* they were organized based on spend volume, but I'm not 100% sure, so don't quote me on that). I was told about the re-organization, because I lost my long-time reps in the shuffle.
I would imagine that they are able to make much better recommendations now, since their knowledge is very specialized. They could look at what's working well for one site in a niche, and incorporate that into a competing site's campaigns.
Unfortunately, I stopped working with them in February, so I don't know how the re-organization shook out. But I'd imagine it would be to the advertiser's benefit (and Google's, since happy advertisers spend more money).