So has anyone tried it? Any tips?
Another thing is to get a long handled net, and paddle gently along bulkheads and pylons, and just scoop them off. There's a trick to coming behind to get them to swim into the net, sometimes they'll evade it. I don't know of the whole scam to it, but I've also seen guys put a light out at night, and between that and something else they're doing, the crabs will swim up to them, and then they get them with the net.
Nom nom nom...