I thought maybe X-Potions or X-Ethers might have some use, but as you say the cooldown means it's probably a once-per-fight thing really, I thought possibly people might be taking them as a big boss attack hits to lighten the load on the healer. And their cost isn't too prohibitive, 1 batch of 10 filtered waters gives 30 x-potions.

And yeah, nine lime sulphurs for 3 hi-elixirs is kinda silly really.