I haven't watched the talk yet, but it's quite possible that having more sysadmins is what allows them to use 40 servers. One guy might have needed 80 servers

I haven't watched the talk yet, but it's quite possible that having more sysadmins is what allows them to use 40 servers. One guy might have needed 80 servers to accomplish the same work because he's too busy to optimize anything. :)