At this point, I think only morons would want to wild collect CPs illigally. It's so cheap and easy to propigate your own that the only plants in any real danger are outside the USA or very very rare. What caused the origenal poaching problem wasn't people collecting plants to sell, but by people hiking in parks, seeing a cool CP and trying to bring it home as a house plant. Now that it is common knowledge that is illegal and that the plants die right away, most people won't bother to steal them anymore. And even though so jerks do dig up ones in their backyard to sell, the population of most CPs in general have recoverd so well that their are enough in other areas to keep the populations up.
As to collecting seeds and stuff, the legality of that varries by location and species.