I use them. Especially since my assassin doesn't have much magical trinkets yet (still working on his enchanting skills).
Concerning money, the economic mod I made for myself changed the merchant wannabes of the game for real merchants.
As a result, when I sell a sword worth 50k, I get around 12k for it. So my little potions aren't worth much.
But I never stack the same potion effect. (no triple heal potion or eleven sujamma at once)
In any case, potions are pretty useful.