I agree completely. The only actual potion that I've found sellable in any large quantities are HQ mega HP pots. I do like having a slightly shorter CD on the HQ pots though, it's a nice touch.

X potions are prohibitively expensive for most buyers (double cluster cost seems imbalanced) and people don't seem to have a large need for mega ethers. Lower level hi-potions and hi-ethers are handed out like candy from half the quests in the game so nobody buys those. Elixirs seem like they should be pretty useful but not many people buy them even at very cheap prices.