Yeah, this is my only real complaint with this. Internally their IPv6 support is pretty garbage, which is kind of fine since your internals shouldn't be exposed externally anyways, so it's in theory possible to have an internal IPv4 network that exposes traffic over IPv6 to the public using something like a load balancer.
Load balancers are already somewhat expensive- the base cost for each load balancer is already $16.43 a month before bandwidth. Three IP addresses, 12 cents per day each, over 30 days is another $10.80 a month. In other words load balancers just had their base price increase by 65%.