Would you say that the ratio Blacksmithing / Clothing / Woodworking / Jewelrycrafting to Enchanting / Alchemy / Provisioning Master Writs is unbalanced? That is, there is a far greater chance to get the Equipment MW than a Consumable MW.
The suggestion is quite simple: create green- as well as blue- level Provisioning and Enchanting Master Writs.
Triple the chance of getting a green MW, double the chance of getting a blue MW. Set the price to 3/4 (blue) 1/2 (green) of the money we get from the purple Master Writ.
With this, you get to kill three cliffracers with one boulder:
1) hoarders get to use the recipes they may - or may not - have (thus pleasing us A LOT)
2) players can use the materials they have collected in the Crafting Bag
3) if a player does not have the recipe, he / she can buy it (economy)
Pro 16:18 - "Pride comes before the fall."
a knee jerk reactionist