Adding IPv6 would cost them money. Probably a relatively small amount of money, but still money. They get nothing from that investment. As long as they have IPv4 addresses to assign to their customers, there's basically no demand for IPv6 addresses. NAT and UPnP work fine for just about everyone.
I think the only way we see serious IPv6 adoption in North America and Europe is government mandates.
I have municipal fiber and used to have ipv6 before they came out and swapped out my little modem for this fiber to ethernet converter box. Now I get no ipv6 anymore
just sayin, it could be a configuration issue.. like in my case.. im sure someone has to flip a bit somewhere but talking to T1 support is useless and i didn't care enough to press the issue
Those who do and use Winblows, don't ignore your patches. Especially if using any kind of public wifi, definitely if you port forward for any reason or have any P2P software running that might've done UPnP... Just a mess.