Brad Templeton has published a piece on network neutrality and the "internet contract" which is worth reading. He generalizes the issue to all kinds of packets and business models, and then points out the folly of various payment schemes, concluding:
The contract is worth defending not just because it gives us cheap internet or flat rates. It is worth defending because it fosters innovation. It lets people experiment with services that would get shut down quickly if people got billed per packet. Without the cost contract, great new ideas will never get off the ground. And that would be the real shame.
Worth a read, including his original piece on the internet contract.