The Dungeness crab got its name from the town of Dungeness, Washington, where it was first harvested; in fact, it was the first commercially harvested shellfish on the North Pacific coast.
Here are some other Dungeness crab factoids:
So, essentially, every year people spend from 26 to 80 million dollars on crab exoskeleton and entrails. The rest of the beast is awfully tasty, though.
Thanks to Northwest Harvest for all of this information except the bit about the entrails being horrible. That I learned from experience.