firewood - emerald ash borer

I've been to CGs that prohibit outside wood yet they don't sell it. I've been to CGs that prohibit outside wood so they can charge 3-4 times what you'd pay for it anywhere else. I've been to CGs that sell kindling that they refer to as firewood. I've been to CGs that have fire wood somewhere on the property but they don't deliver it. I've been to CGs that have run out of wood well before sunset. Not that I condone bringing your own firewood, but I can see why it happens.