There are age old quests/places where you can turn in Baubilium and Golem parts and leystones for gold and EXP. I would like to recommend this get expanded to include things like ores, herbs, and other wilderness goodies. Many of these things exist for the lair mechanics, adding them to the town would entice conflict over these resources.
Afaik you can sell most mineable items at a certain store for a few gold each. I don't really see the benefit in making it harder for lair PCs, who have lairs by virtue of (generally) having to be outside The Hub in the first place.
Hopefully Magnatz is settled in and we'll see the return of some merchants there!