I put in a feedback ticket last night for this myself, mainly because the JC Master Crafting writs we get now are totally worthless because the expense to make the items in the writs far outweigh what you get in return. They need to increase the grain drop for refining, deconstructing, and increase the amount of jewelry that open world mobs drop. Otherwise my dozens of Jewelry master crafting writs just stay on my mule collecting dust.