ok I seems to be the only dungeons and dragons player here with a bunch of corerule books which explain why things SHOULD work like that or not.. ok LOS isn't a AD&D based game but some stuff are taken from it.. like the 10 to -X AC.. its a second edition AD&D system..
so I will explain how its working in this corerule book about the wands and staves.
using a magic device require a minimum of magic skills and knowledge.. if you don't know how to use them you will fail it for sure. like if you need an activation word or an incantation to do. and in the second edition only thieves had the skill to use magical device (and casters) in the third edition everyone was allowed to use them.
now the dmg from a spell inside a wand... the dmg stored in the wand are equal to the spellcaster level.. in AD&D a mage lvl 5 can start to cast fireballs.. which does 1d6 dmg per lvl.. so for a mage lvl 5 the dmg from the wand will be 5d6... if a mage lvl 10 make a wand the spell will deal 10d6 dmg.
thats how its working (and probably logical) about a wand should be.. BUT AGAIN LoS isn't AD&D so variation from that could be done to adjust the rating of the wands used in the lands.
I think like everyone too.. wands don't deal enough dmg to be useful to me.. well.. even a burn from kampfer deal more damage then a shatterstone rod so I won't keep them and I will simply sell them... and even the price for such items isn't high enough.
a thing we could had from those wands could be "visit the Amber Mage to recharge your wands for a fee" fee could work from (base cost x mage lvl x lvl of the spell)
The Amber Mage.. Farside.. Galm(for healing wands).. and some others could offer the services.. and each of them deal different price due to there levels so a spell could be more powerful if you charge it from Farside than the barbarian shaman for exemple.
oh well.. I speaked enough