You ask the old dwarf why his service is free when he could be making much money from it. "I used to be a wanderer of Orgrun until I became too old to travel across the lands on foot. So, since I still yearned for adventure, I got myself this carriage. And after a few months of traveling I found a young adventurer who needed a ride. I knew travel was hard for wanderers so I gave my service for free. Ever since I've been chauffeuring adventurers and wanders while seeing the world. It's a fine life."