I believe that most of the time you have to dive and selectively catch the fish, but I know that outside of the US there are a lot of places that would likely enjoy the increased income that catching the fish would bring. There are also more upscale restaurants that like picking up the weird and different, I know of one that only deals with wild game meat, lion steaks, moose burgers, etc. Lionfish and other types of fish would likely be no different.

I will probably be going to Jamaica within the next year or so and have thought of ways that I could catch them and bring them back to sell. If the can be caught live they would probably be worth more that way, which is another option for the wild ones that don't belong.