for role play is very good use a staff, but if u dont get any lvl up for this, its a litle useless since u can use magic.
But if you get a staff that has a spell that you don't know, can't find, or are unable to do because you don't have enough experience in a particular school of magic, then you have a sort of upper hand on things because now you can do something you couldn't before.
If you get your hands on the same spell, by all means, sell the staff or whatever. But until then you now have a spell that wasn't available to you before that costs you no mana and had no repercussions except that one of your hands is no longer free. Then again, in Skyrim, your hands wouldn't be free even if you had the spell because spells now occupy hands and you can't just cast them while carrying both a sword and a shield, or a two handed weapon.