Please click on the below link to view the first two parts of A History of RPM:
Part 1 - A History of RPM
Part 2 - A History of RPM

The volume of domains being dropped was so high that Verisign found it was being buffeted by the Google margin grab. During this time, you could track the impact a one cent PPC drop would have on Verisign’s revenue line.

I remember conducting an analysis that concluded it would be financially viable for Verisign to underpin the entire domain investment industry so domains weren’t dropped. From memory it showed that every domain dropped cost Verisign $73 of market capitalisation. By underpinning the PPC payouts by diverting marketing dollars directly into the monetisation companies Verisign could halt the tsunami of drops from marginally profitable domains.

Several years after the GFC Google had reached rock bottom with the margin grab. I can only surmise that if they kept on increasing their margin then the partner network would essentially collapse. This would not be a good thing to happen right in the middle of rumblings about monopolistic behaviour at the legislative levels.

What we shouldn't miss in this whole saga is that Google's behaviour has been completely economically rational. They have the interests of shareholders to consider and not the domain industry. Those domain investors that moaned about what Google was doing needed to make changes to their businesses and do something different.