1.) IPv4 is still heavily favored over IPv6.

2.) Market segmentation: keeps home users from easily hosting their own services without spending $$$ on an upgraded plan.

3.) Adding on to #2, I've seen claims of providers putting IPv6 behind NAT, so don't think full IPv6 acceptance will solve this problem.

> I've seen claims of providers putting IPv6 behind NAT, so don't think full IPv6 acceptance will solve this problem.

I get annoyed even when what's offered is a single /64 prefix (rather than something like a /56 or even /60), but putting IPv6 behind NAT is just ridiculous.