I'm very familiar with the concept of the "ore shuffle" - see my prior thread, including spreadsheets and everything.
Bottom line is that the shuffle is a volume-driven endeavor. Lots of ore, almost zero movement on any of the products (both cut and uncut gems, enchanting mats, or enchanting scrolls) kills it.
I could make a thousand gold maybe every three days.--
flickr | 'Cause I've been waiting, all my life just waiting
For you to shine, shine your light on me