Why do you need to put crafters' gears being seperate again?

[Bishop81]

This is due to the market for intermediate products.

Let me get this straight,

Generally, omni-crafters do not sell intermediate products,

Specialists, on the other hand, have to purchase these intermediate products at a premium

So who is producing all these intermediate products that are sold at a premium?

Since we ruled out omni-crafters ... that leaves only specialists. Who else can craft?

∴ Intermediate products are sold and purchase at a premium by specialists. The solution is clear. Sell intermediate products and make a killing! (Gil is gil.)