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Given that this is Japan and NTT, it's way less likely that this is profit-driven and exceedingly more likely that it's just something completely dumb, like, say, that their VoIP routers can't pass through a /64 cleanly or that they decided to implement this for that service.
Like, there's probably 5 of us signing up for VoIP just to get a /56. They aren't making a fortune off of this policy.
That might explain why there isn't just an arbitrary fee for a /56 without VoIP though. Correct me if I'm wrong here (and I'm sure you will :P) but can't VoIP just be run over normal internet like any other protocol? Does it need special handling?
Yes, it's just a server on their network available both via the normal IPv6 routing, and via a dedicated DHCP/IPv4 feed to a private net you get when you have the service (I think some of their gateways use v4 and some v6?). Normal IPv4 internet is either PPPoE or DS-Lite.
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