sfx2000
Part of the Furniture
ISP's are either peers or customers - peers don't pay, and customers do..
http://drpeering.net/white-papers/Art-Of-Peering-The-Peering-Playbook.html
Once a customer, never a peer - most of the big players peer, the small guys, and folks that do layer 4, they pay - this is why Google scooped up tons of dark fiber back in the days when Global Crossing and other fiber operators collapsed..