...do you seriously keep stacks of every single gatherable item in the game "just in case" you need it to craft something? Use the MB. Sell what you're not using currently and buy/gather it again if you do need it. 3.0 items DID use 2.0 mats, and I had no trouble crafting all my own gear as I leveled all my jobs through it, using only 2 retainers to store them.
