UPDATE 4.10.2019 - Changes to the above
thanks for the feedback! We've sifted through it and found lots of valuable input. In response to your suggestions, we'll be making two important changes:
1. We will not increase the price of re-rolling quality at this time, due to a risk of it sinking less silver than it currently is.
Re-rolling should be MINUS 50% of what the current price is now, that way re-rolling would be used more often and actually worth it... more people using it to re-roll equals mass amounts of silver being sunk.
Item quality is already not reflected in market prices and largely not profitable as a business model.
In crafting, specifically artifact crafting it is not viable to go for ex / mp quality items and expect a profit, because the amounts you would have to charge for them are not paid by players.
This is with max spec and max food quality crafting chance btw.