I would like to ask an earnest question here, because I work in an environment where IPv6 has been deployed for more than a decade, and it's just automatically part of things we do and have to solve for, so I will openly admit my perspective can be warped. I am truly curious about what the perceived blockers are for you, and others with the same perspective.
You appear to run a residential ISP. There are essentially 3 things you would have to do to deploy IPv6.
1. CPE would need to support it.
2. Your network infrastructure would have to support it.
3. Subscriber services ( DHCP / DNS / IPAM ) would have to support it.
Putting aside the 'zero value' idea, if you were to decide to take steps today , what are your blockers?