johnhh - 8:46 pm on Jun 28, 2013 (gmt 0)
Logically if you move all the national site up to the top since they advertise anyway
Um it's a little more simplier than that, I had a contact in what is, and was, a big brand who told me that after you spend $x million on Adwords you get an invite to go over to the 'plex. Then they 'hint' on what you need to do to get higher positions in the natural SERPS. Mind you they probably add you to the whitelist as well.
The big brand got so big in Europe it was purchased by a even bigger American corporation. Oddly all the original founders are no longer in executive control.