As time passed the external camp continued to develop, quickly filling up the large empty spaces within the 25km2 layout. The braver merchants who took a chance on Frost's new territory in the earlier stages had set up their stores in the prime locations. Easy access to customers, ample territory and fair and reasonable rates and taxes. These rare few made real bank in the initial stages, far more than they expected. Word of mouth of course spread thus welcoming a 2nd and 3rd wave of merchants hounding at Frost's door for a piece of the pie. Of course their deals weren't quite as generous given that they were later to the game, but the profit margins were still immense. The Dungeon was just too prosperous.
The variety of monsters, their numbers as well as the treasures and materials found within drew so many adventurers that merchants could no longer afford to neglect such a venture regardless of the percentages Frost would accumulate just from being the landowner.