This is not how it works at all. A bitcoin block can have 0 transactions and still need the same energy to produce. a) Sending payments is not the only purpose

This is not how it works at all. A bitcoin block can have 0 transactions and still need the same energy to produce. a) Sending payments is not the only purpose of the network, it's issuance, it's security, it's to make the ledger immutable. b) No one's buying a burger with bitcoin. Bitcoin's production is a monetary base. Using the same block space you can have an infinite number of economic transactions happen with the same power consumption (block) on multiple layers, each with a degrading level of security. Of course you don't need the full force of the bitcoin network for a coffee or burger.