Counterexample: network TV, radio, facebook.com, gmail.com, pretty much all of the ad-supported web.
>Peer-to-peer only ever made sense for popular stuff that people won't pay for.
Counterexample: Skype (freeium model on a P2P network). The content wasn't "popular" it was private phone conversations and people paid for it.
Counterexample: Bitcoin (runs on a P2P network). People pay fees to miners so that the network relays their transactions.
Counterexample: The internet. A giant P2P inter-network with all sorts of different business relationships. Many of which involve paying someone to send a packet that is only meaningful to a particular party.