I'm another player who doesn't use anything magical with charges on it. This includes potions, wands, arrows, and even spell scrolls if I can help it.
Of course, I don't sell them either, because if I have to use them later on, wouldn't it be a shame if I had to buy them back?
Well, experience has taught me you don't have to keep them (although I still hoard like crazy, can't help it, I may be a hamster). Sell everything you won't need, even if you think you do.
Wands are useful, but not if you don't use them (and you don't have to). Sell them all if they are not an integral part of your strategy.
Have your mages pen spell scrolls as much as possible, sell anything you can't teach them (although parties with low lore benefit from keeping all the identify spells you come across, as long as you use them, and parties with Xan as the only mage are better off if you keep a few web and fireball spells he can cast from scrolls. No more than five of each nessecary though).
Magical arrows, bolts and bullets. Keep some of these. Always have your characters carry around 40-80 of these, but always take them from your stock first, and from the stores second. You should never have to buy enchanted arrows. Don't fire them unless you have to.
The potions... sell them. If you don't use them now, you won't use them later.
Keep some healing potions, but not all. They help out in tougher fights, but the 8 hp becomes less and less significant later in the game. You end up needing six of them just to restore the damage caused by a single blow. Heal spells work better, you're right to trust in clerics.
Potions of invisibility are useful if you don't want to fight every fight, but I have a feeling they are not for you.
Potions of firebreath and oils of fiery burning can be useful on occasion, but fireballs work better (although a hiding thief with a potion like this can get into a better position than most wizards). In any case, pick one, lose the other.
Finally, there are the oils of speed, which can be extremely useful at the right moments.
You won't be needing any of these potions, let alone the ones left unmentioned. Have a spring cleaning, toss all of them out of your inventory. In the worst case scenario, you have to go back to the store and buy some of them back. You'll still have made a profit, and have much more spare space in inventories.
Oh, right. Almost forgot the only really, really useful must-keep potions and scrolls. Anything protecting you from petrification, as well as some stone to flesh scrolls, is always worth carrying around. As long as you don't overdo it. As a rule, excepting healing potions, you don't need more potions of one kind than fit into a single slot.
Now get cleaning
