Why is there no refund for the 48 hours maintenance?

[Krokov]

If it's "only" a dollar, then it should be quite easy for them to just add those 2 days to everyone's subtime.
No idea why you guys go to bat for billion dollar corporations like this.

But that's the point. It's only a dollar so why should it matter if you can't log in for 2 days for maintenance? AFAIK Blizzard has never refunded players because they couldn't log in due to maintenance. Square Enix though has refunded days when there's been significant interruption to logging in/gameplay for players.