Hmm. The price one must pay. Well, the mod I am working on as a house mod, and time killer is a mod on a island, Little in the way of farming but it has a massive dock and even a shipyard (building ships). Since your mod will take place on a island as well, perhaps you could impliment a import/export dock on your island. The larger your society grows, the more things you can export, the more money you make.