Karak Azgal is a background book that is a must for roleplaying officiandos. Karak Azgal was once a rich Dwarf hold, but it fell to the forces of chaos. A dragon moved in, and dug out much of the treasure hidden in the dungeon to form a horde. This dragon was slain, over a thousand years ago by a Dwarf named Skalf. He claimed the treasure, and ownership of Karak Azgal. He realised the hold was too infested to clear out, so he built an enclave above the Hold and set up court there. A city has now grown up, rich from the treasures brought up by adventurers. The dwarfs encourage folk to go down there and recover their ancestors goods (and tax the hell out of them for doing so) but aren't too fussed about clearing it themselves- Dwarfs take the long view that one day the Goblins that live down there will go extinct, and when they do, all the gold down there will come back into Dwarf hands. They are, in fact being very generous in allowing folk to go down there and bring it back up- why, they might even get to keep 10% of it! That's practically giving it away!
The city setting of Karak Azgal is perfect for Dwarf gags, intrigue and numerous excuses to be sent into the dungeon. It should be richly populated with interesting characters, and should logically extrapolate what happens to a city that has grown up on a treasure horde.