Indeed yes it will be very likely that a provider would be selling service. A coffee shop might provide a code for extra access on the receipt, or a home user might ask for a small but non-zero payment of cryptocurrency after a certain amount of free use, or a openwifi provider might want to let users pay small amounts of currency to prioritize packets. In either of these likely use cases, wouldn't the net neutrality principle that all packets be treated equally be violated?

This begs the following questions which are seperate from the discussion of the definition of violation of net neutrality: Won't such monetary incentives help encourage people to setup open wireless routers? Might net neutrality rules hamper the widespread deployment of open wireless?