...on your non casting toons, so you can reimburse at least once in a while to the people healing your raid (and even to some casters as well).
It's sad when a raid is done and people are too quick to loot and ask for named items and what not, but noone asks for a pot count. There's no need to bank 50+ potions on your casters, pass some to melee and be nice to those blue bars.
I'm writing this right after a ToD, and no, I was not on the casting side.