Yzman
Deity
And American merchants made %1000 profit on Ginseng, Furs, and Silver because Swedish custom houses were desperate for it and their European clients would kill for it. Give them a mega + bonus when it comes to Spices while adding tea, obsidian, etc.
See where I'm going with this?
I don't see where you are going with it at all to be honest. This is a game, they pick certain parts of civs to express for gameplay purposes. Indonesia is known to be home to many unique spices hence the UA "Spice Islands". It makes sense the unique luxuries they get are unique spices to their islands.
Whats wrong with Nutmeg?