One thing people overlook with ala mhigo in particular is it's history. Ala mhigo for the most part had no real stability in the long term and could only really earn it's keep by hiring out mercenaries after Ul'dah bested them at trade. Ironically the ala mhigans got the industry they craved but at a great cost to their freedom, they essentially got dealt a monkeys paw. Those who fight for it may do so since there really isn't much to go back to in their eyes.
