Tell me what is so fun about being a virtual janitor?
What's so fun about those millions of simulator games? I know there's a garbage truck sim.
I like it because this tweet. http://www.rockpapershotgun.com/2013/07/24/viscera-cleanup-detail-now-with-co-op-cara-lawsuit/
Which is what I imagine it to be.
Usually it's fun to simulate something exciting that would be prohibitively expensive/take extensive training etc, to do in real life (flying an F16, racing a formula car, commanding a submarine etc.) - simulating drudgery is not particularly appealing to most people. Whatever floats your boat I guess.