A single bitcoin may be pricey, but fortunately there are eight decimal places after that first coin, enabling users to spend however much or however little they want.
You're right about the lightning network, it stands to revolutionize the bitcoin network by providing an instantaneous zero-confirmation payment layer on top of the bitcoin blockchain. Critically, though, it wouldn't work at all without the security provided by all that "wasted" electricity. Think of the lightning network like the HTTP protocol layer resting on top of the TCP/IP communication layer. HTTP wouldn't work without TCP/IP and TCP/IP wouldn't be nearly as useful without the myriad of protocol layers which it enables. This is still early times for bitcoin, and you ain't seen nothin' yet.