1, because the stone crab head is relatively small, and the stone crab body meat is not particularly much, and the crab yolk is almost no, so eating stone crabs people think it is not cost-effective, and its pincers are very sharp, if a little careless, it will be scratched.

2, stone crab shell is like armor, than the general crab shell is much harder, so it is difficult to break open. And stone crabs don't have much meat, and it's very hard to eat them, so not many people are willing to eat them.

3, in the seaside, stone crab is basically the cheapest variety, no meat but weight is quite heavy, so the price of this kind of crab is too low, the fishermen will not spend effort to catch it.