I think some of that would depend on exactly what sorts of beliefs your average witch or wizard has about werewolves. If some morons out there believe that you can catch lycanthropy by handling a dish a werewolf touched or using porcelain throne after he finished with it--both things people believed erroneously about AIDS patients at one time--then they wouldn't want a werewolf in their home, even to exterminate doxies. (Heck, doing a Remus fic, I looked up ways people have believed you can become a werewolf... drinking water downstream from one is on the list!) Or it could just be plain old bigotry, the "No Irish Need Apply" sort of attitude that kept a lot of people from even menial work.