Okay, so this whole "Islands in the Sky" campaign setting confounds my sense of verisimilitude, purely on account of resource logistics and management. The very nature of these earthmotes is to isolate; each Island is its own little world, connected only by the arrival and departure of airships.
A number of questions quickly arise. First is a question of consumption that I have yet to find a satisfactory answer to: how much land is needed for a thousand people to survive off? As in, how much food must they grow? What other resources do they require? With such a limited amount of land available, is it possible for people to thrive in any way? Or does society fall into a survival of the toughest type of existence, due to the scarcity of resources? Seafood would obviously be pretty important, as would having airships to get down to the ocean in order to fish.
What about communication? At what point do magical means of communication in a fantasy setting become farcical? Obviously, it would be silly to have cell phone or star trek type communicators. But what about something like a weekly newsletter that gets dropped off in town squares? That would be more appropriate to the fantasy feel while still allowing for plenty of communication between islands, although the islands are still dependent on airships with this idea.
So, if our little societies get most of their food from the sea (and some that they shoot out of the sky), and most of their communication comes from delivered newsletters, this leaves one most important, supreme resource: the airship.
So let's put some Gnolls on some airships! Pirate Gnolls! Ahoy matey!