In any fictional world, there will be the honest and dishonest characters. So how do the latter operate? What makes them dishonest in the first place? How does their dishonesty impact on others? Does their greed prove to be their undoing?
What are the downsides to trying to enforce rules and laws in a magical environment when those you're trying to apprehend are likely to be at least as magically powerful as you are?
I think there would be scope for comedy there too.