It's something I've only recently been made aware of as well. Shocked we're not seeing more push for ipv6 everywhere given that it sounds common enough. If I don't have an IP address, I'm not getting the Internet I'm paying for; I'm getting access to a network that happens to itself have a connection to the Internet. Not unlike some of the BBS's in the early 90s which had Internet access -- I might be dialed in, but that didn't mean my computer itself was on the Internet.