We went to the fish market yesterday and bought 2 1/2 dozen blue crabs, they were so cute when they were alive, crawling all over each other. When the guy pulled them out of the bin, they grab on to each other and look like a barrel of monkeys. They were covered in Old Bay spice and steamed. I ate a bunch, I just wanted a taste and they were quite delicious - I guess I have no self control.
We had leftovers, so I cracked them all and removed the meat and I'm going to save the shells to make a stock. But this might make you appreciate imitation crab and the cost of real crab meat. This is the remains of 4 crabs, you can see the ratio of meat to shell.