I think it's a combination of this and the fact that everyone has gone forever without bothering to use them.
As it stands right now, some of the potions are not completely useless. They are just not worth the high prices that we Alchemists feel they should be selling for.
I agree with Vaasteel, the status removal potions are mostly worthless given the fact that you have to wait so long to use it again, when mobs are spamming the ability.
As for some of the others though, Mega-Potions, Mega-Ethers and Elixirs. They are not worthless at all. It would be great to see the reuse timer reduced a bit, but my LS has been using them and has actually found them to be helpful in "Oh Shit!" situations.
The stat boosting ones, can be useful, but again it only gives you enough time for 1 combo and then you likely wont be able to use it again during the entire fight.
It all boils down to the cost vs how effective they currently are. Farm up your own mats to reduce your production costs and lower your prices. They will sell eventually. You might not be getting rich off them anytime soon, but they will sell.
Just cross you fingers and hope SE takes note of our opinions in this subject and makes some adjustments to help things improve.
