I've read about this before. I think that one of the main ideas is that you can basically start your own society independent of other governments' rules. I think they are just starting in conjunction with other countries because you need a base to start building from. I've read that one application of seasteading could be to have skilled programmer from India, for example, like off the coast of California. It could be easier than having them immigrate to the United States. They could just work from the water and people from the "mainland" could come and visit them as needed. They also probably wouldn't have to pay taxes, which sounds pretty nice. I think I would give it a shot.