Thanks for all the replies.
Well I suppose a slow trickle of something (be it a small contribution from the authorities) coupled with the odd burst of well paid seasonal work could be kept going with a barter system to enable the purchase of "on grid" items. The strange thing is though that all these off gridders need to cooperate with each other one heck of a lot more than people living in cities in a way that kind of counteracts the reason why most of them say they are up there.
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