I don't think it's any more of animal abuse than what those crabs normally have to deal with. I just don't know what you'd do after you put in your money and the crab comes out, though. Like... just put it in your purse and hope that it doesn't regain consciousness and figure out how to break out of the case?
"Whatever you do, don't fall off the bridge! It'll be a pain to try to get back up again." - Private, DW 8