Unique items that you can only get from a specific merchant from a specific hold, most likely portaining to the hold.......oh....
wait we're talking about Skyrim.
Nothing. Money is worth nothing in Skyrim. Seriously I'm the richest mage.
-Why buy Soul Gems when I enchant and Soul Trap anyway
-Why buy Generic Staves I get as loot anyway
Not only that, but the merchants svck as merchants. They never gain enough money unless you buy their inventory. Their own economy never goes up and down. They never have enough money as I do.
I'm starting to think that maybe my mage needs to setup his own merchant shop and show them how its done
-Let the hero gain money slower, so he can try to acheive some really expensive equipment and mock him on his adventures of how he can't get this ridiculously high priced Adventurer's Staff