said by jvanbrecht:they dont have peering agreements with every isp thats true but with a large amount they do on a net basis google pays nothing
That is incorrect..
Hop 7 of a trace to google.com
7 google-gw.customer.alter.net (188.8.131.52) 54.481 ms 49.640 ms 50.306 ms
UUNET (now Verizon) does not use $-gw.customer on peering routers, only customer routers, therefore google is paying as a customer, not a peer.