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This has probably been suggested and discussed before, so forgive me in advance.
It seems to me that many trade skills aren't really worth doing in terms of making gold. I haven't closely examined the numbers, but gathering/inkmilling for example - when inks are selling for 50% of Rurin's costs, it seems far better to hunt or do something else. I really enjoy gathering/inkmilling, so I still do it, but it's definitely not worth it in terms of time and energy.
But.... why not increase the cost of items sold by people like Rurin? Why not double the cost of any item that adventurers can readily create? By doing this, it creates a need for trade skills (which are open to everyone) and it encourages "house" mentality. aka, people working together and being reliant upon each other.