It would definitely be a highly sought after group of pixels, bringing in multiple groups during heavy lag times. This could be both a good and bad thing.
If the dungeon was large enough, it could probably get 2, maybe even 3, parties at once. There is always the chance that some newbies to the server could stumble in it, but anyone could put up a sign saying a few witty things poking fun of rat catchers. If they think it's a joke, then they'll get a good start on paying attention to their surroundings.
I'm sure there's a hundred reasons not to do this, but it is a suggestion!
