This actually happened over the weekend:
I'd go further and say, that most of people willing to pay that much (serious about their backups and availability) already have some solution in place.
The service is very appealing for people, who don't really care that much (because it's very easy to use). I'm afraid that those people won't pay $19/mo.
Smart people go after customers willing to pay more.
Actually, I have some old cheap clients I fired some time ago... Should I send them your way? They need someone to yell at and then laugh at when the cost of their needs are quoted.