I really enjoy the show, but I wonder whether the name of the show is just too limiting. There are a lot of interesting and incredible jobs that people have, but they aren't what you would necessarily call a "Dirty Job".
I guess my point is that maybe the show should have an expanded name that would not put the show in such a box. For instance, maybe you could rename the show, "Wow! What A Job", "Amazing Jobs", "Now That's A Job" or something along these lines. You would be able to cut across a much wider spectrum of job types.
I believe there would be a lot of interesting stories about the different jobs that people have, even though they would not necessarily be getting dirty. I think you would greatly expand your shows idea pool as well.
I enjoy the show and am always intrigued at what Mike will get himself into next. I wish you continued success.