He is definitely the wealthiest among all the Gray Dwarves!
The only thing that doesn't match is his status. The wealth Koravos brings should have given him greater power. Many Gray Dwarves believe that a Dwarf who can dig out a cart of good ore is sure to dig out a second cart of good ore. If they follow Mr. Koravos, even the most barren mine veins can flow with rivers of Mithril.
Of course, certain hired bards played a crucial role in spreading this belief. They composed numerous ballads for this Gray Dwarf, especially about his good relationship with the Mage, which was sung repeatedly. After singing, next to Koravos's residence, there was a good tavern where these bards could receive handsome rewards.