A comprehensive sweep of the place should net you at least 1000 crowns, and maybe twice that, depending on your luck. The premise here is that you kill everybody in the Hanse Camp except its leader, loot the place as much as possible, then fast travel to a blacksmith or merchant and sell everything you've stolen. However, there's an exploit by which you can essentially play them over and over, and gain major rewards from doing so. The problem is that once completed, there's no official way to reset them and play them over without just restarting the game or going back to an earlier save.
There are three of these massive camps in Blood and Wine, and for those who like combat they represent some of the high points of the game. The intended idea is that killing all the bandits and their leader empties the base, whereupon Toussaint's knights can move in and turn it into an encampment. One of the new additions in this area are Hanse Bases, essentially huge bandit camps filled with enemies. In order to utilise this, you'll have to own the Blood and Wine DLC, not to mention having accessed the region of Toussaint.
