Inscription preparation for WoD

So I recently started making glyphs and selling them on the AH. Since herbs are so cheap right know (around 20g a stack on my server) I thought it would be a good idea to mill a lot of herbs into ink of dreams and buy older inks with them from the ink vendor. My guess is that WoD herbs will be a lot more expensive at the start of the expansion. Also you will probably need the new ink to buy older ones from the vendor.

So by stockpiling now I'll increase my profit margin when WoD hits, at least that's the plan.

What are your thoughts about this?