[tptacek]

They want to charge you for the drop, the space in their RIB to store the drop, the maintenance effort required to keep the RIB entry configured correctly, and the ongoing support costs of people who do things with their Linode boxes that require more than one IPv6 address.

[syncsynchalt]

The cost of maintaining a /64 is the same as maintaining a /128, and might even be less.

/64 is the basic unit of allocation in IPv6 and all of the tools and allocation protocols assume it.

[tptacek]

The cost isn't the same if /128s select for high-maintenance customers.