In Ankh-Morpork, the Wizards guild claim to operate outside the mundane laws of man, but how true is this?
For example, in Reaper Man, we learn that while the university doesn't pay taxes, they do make an entirely 'voluntary' donation of the same value as the taxes would be.
What other workarounds has the patrician made to keep the Wizards content while still getting his way?
(Inspired from Is murder a crime in Ankh-Morpork? but more specifically about how the Wizards refusal changes things)