Why would these people likely own an XBJ if they don't have a consistent internet connection? Are they in such a black hole of no interwebs that they don't know it has a 24 hour internet check in?
I'm sorry, I don't see a likely situation where someone wants an XBJ so bad that they must have one, yet doesn't have a secure enough connection to either a) not care about the 24 hour check in or b) know about the fact that 24 hour check in exists.
And if you buy one and don't know about that? Well, sorry about your luck. It's not like it hasn't been plastered all over that thing you can't connect to for more than 4 days out of a week. I hear they call it the internet. Check Wikipedia on your phone or tablet if you need more information about it.